What posture defines the standard anatomical position?

Standing upright, facing forward, with arms at the sides and palms forward. The feet point forward, giving anatomy a consistent reference position.

In anatomical language, what does superior mean?

Toward the head or above another structure. Inferior means toward the feet or below.

Which anatomical plane divides the body into left and right portions?

The sagittal plane. A midsagittal plane divides the body into equal left and right halves.

Why does the body use feedback mechanisms?

To regulate internal conditions. Feedback compares a condition with a set range and triggers responses that adjust it.

What is the order of structural organization from simplest to most complex?

Chemical, cellular, tissue, organ, organ system, organism. Each level builds on interactions at the preceding level.

What does anterior mean in human anatomy?

Toward the front of the body. Posterior means toward the back.

Which plane divides the body into upper and lower portions?

The transverse plane. It is also called the horizontal plane.

The maintenance of a relatively stable internal environment. It is dynamic rather than perfectly unchanging.

Which major body cavity contains the brain and spinal cord?

The dorsal body cavity. Its cranial cavity holds the brain, and its vertebral cavity holds the spinal cord.

What does medial mean in anatomical language?

Toward the body's midline. Lateral means farther from the midline.

A rise in body temperature triggers sweating. What control pattern is this?

Negative feedback. The response opposes the original temperature change and moves the body toward its normal range.

Which anatomical plane divides the body into front and back portions?

The frontal, or coronal, plane. It separates anterior from posterior portions.

Which major body cavity contains the thoracic and abdominopelvic cavities?

The ventral body cavity. The diaphragm separates its thoracic and abdominopelvic portions.

What does proximal mean when describing a limb?

Closer to the limb's point of attachment. Distal means farther from that point.

How does positive feedback differ from negative feedback?

Positive feedback amplifies the initial change. Negative feedback opposes a change; positive feedback continues until a stopping event occurs.

Which tissue type covers surfaces and lines body cavities?

Epithelial tissue. It also forms many glands and often serves protective, absorptive, or secretory roles.

Which tissue type mainly supports, binds, and protects other tissues?

Connective tissue. Its cells are typically separated by an extracellular matrix.

What shared property lets muscle tissue produce movement?

Contractility. Muscle cells shorten or develop tension in response to stimulation.

Which tissue type rapidly communicates by electrical signals?

Nervous tissue. Neurons transmit signals, while supporting cells help maintain their environment.

Why are tightly packed epithelial cells well suited for barriers?

They leave little space between cells. This continuous arrangement limits passage across a surface.

What distinguishes connective tissue from epithelial tissue?

Connective tissue usually has abundant extracellular matrix. Epithelial cells are more tightly packed.

What are the four basic human tissue types?

Epithelial, connective, muscle, and nervous tissue. Organs contain two or more tissue types working together.

What makes a structure an organ rather than a tissue?

An organ combines multiple tissue types for a specific function. A tissue is a group of similar cells and matrix performing related work.

What are the skeletal system's main functions?

Support, protection, movement, mineral storage, blood-cell production, and fat storage. Bones also provide levers for muscles.

What belongs to the axial skeleton?

The skull, vertebral column, and thoracic cage. These structures form the body's central axis.

How do compact and spongy bone differ?

Compact bone is dense; spongy bone has a lattice of trabeculae. Both are organized living bone tissue.

A place where two or more bones meet. Joint structure determines how much movement is possible.

Which bone cell builds new bone matrix?

An osteoblast. Osteoclasts break down bone, while osteocytes maintain mature bone tissue.

What belongs to the appendicular skeleton?

The limbs plus the shoulder and pelvic girdles. It attaches the limbs to the axial skeleton.

What is the main role of red bone marrow?

Blood-cell production. This process is called hematopoiesis.

Which joint class allows the greatest range of motion?

A synovial joint. A fluid-filled joint cavity reduces friction between articulating surfaces.

Which bone cell breaks down bone matrix?

An osteoclast. Bone resorption helps remodeling and mineral balance.

What does a ligament connect?

Bone to bone. A tendon connects muscle to bone.

What is the shaft of a long bone called?

The diaphysis. The enlarged ends are the epiphyses.

Why is bone important to blood-calcium balance?

Bone stores calcium and can release or absorb it during remodeling. Hormones regulate this exchange.

What is stored mainly in yellow bone marrow?

Fat. It serves as an energy reserve.

What does articular cartilage do at a synovial joint?

It reduces friction and absorbs shock. It covers the ends of articulating bones.

Why must a broken bone receive a blood supply during healing?

Repairing cells need oxygen and nutrients. Restored blood vessels support fracture healing.

What is bone remodeling?

Continuous removal and replacement of bone tissue. It repairs microdamage and helps bones adapt to stress.

Which muscle tissue is usually under voluntary control?

Skeletal muscle. Most skeletal muscles move the skeleton, while some, such as facial muscles, insert into skin or other soft tissue.

The basic contractile unit of striated muscle. It lies between two Z discs.

What does a tendon connect?

Muscle to bone. It transmits muscle force to the skeleton.

Which proteins slide past one another during muscle contraction?

Actin and myosin. Their interaction shortens sarcomeres without shortening the filaments themselves.

Where is smooth muscle commonly found?

In the walls of hollow organs and blood vessels. Its contractions are generally involuntary.

What ion exposes binding sites needed for skeletal muscle contraction?

Calcium. Its release inside the muscle fiber allows actin and myosin interaction.

How do antagonistic muscle pairs move a joint?

One muscle contracts while the opposing muscle relaxes. Reversing their roles moves the joint in the opposite direction.

Why does muscle contraction require ATP?

ATP powers cross-bridge cycling and ion pumps. It is also needed for myosin to detach from actin.

Which muscle tissue makes up the heart wall?

Cardiac muscle. It is striated, involuntary, and connected for coordinated pumping.

During a typical muscle contraction, which attachment moves more: origin or insertion?

The insertion. The origin is generally the more fixed attachment.

Which type of neuron sends the signal that initiates skeletal-muscle contraction?

A somatic motor neuron. It releases acetylcholine at the neuromuscular junction, triggering an action potential in the muscle fiber.

Continuous low-level muscle tension. It helps maintain posture and readiness without producing a large movement.

ATI TEAS 7 Science Flashcards: A&P, Biology, Chemistry & Scientific Reasoning

Practice 446 original ATI TEAS 7 Science recall and mini-scenario cards across A&P, biology, chemistry, and scientific reasoning.

Autor Flashcards Open Source App

O tej talii

Build the core Science knowledge and reasoning used for ATI TEAS 7 with 446 independently authored flashcards.

What this deck practices

Structure or concept → function: body systems, cells, molecules, atoms, solutions, and experimental parts.
Function, outcome, or evidence → concept: selective reverse recall when recognizing the name matters in practice.
Cause or condition → effect: physiology, chemical changes, reaction conditions, inheritance, and experimental predictions.
Process and order: circulation, ventilation, digestion, urine formation, gene expression, cell division, and scientific investigations.
Application: short calculations, comparisons, data interpretations, and original mini-scenarios.

The deck does not mechanically reverse every fact. It excludes multiple-choice distractors, exhaustive anatomy lists, obscure chemical nomenclature, advanced pathophysiology, pharmacology, and nursing-school procedures because those mappings do not improve entry-level TEAS Science recall.

The sequence introduces prerequisites before dependent ideas: anatomical language before body systems, cells before genetics, atoms before reactions, and measurement before experimental design. Related forward and reverse variants are separated so one card does not immediately reveal another.

Coverage follows the four Science areas and relative emphasis in ATI's public ATI TEAS 7 content outline: Human Anatomy and Physiology, Biology, Chemistry, and Scientific Reasoning. The public outline defines scope only. Questions, answers, explanations, examples, and ordering were independently authored from common scientific knowledge checked against open educational and official public sources.

No exam question, mark scheme, paid ATI flashcard, test-bank item, or curriculum text was copied. This is an independent, unofficial educational deck by Flashcards Open Source App. ATI and TEAS are marks of Assessment Technologies Institute, L.L.C.; this deck is not affiliated with, endorsed by, or produced by ATI. See ATI's official exam details for current requirements.

Karty w tej talii

Karta 1
Pytanie
What posture defines the standard anatomical position?
Odpowiedź
Standing upright, facing forward, with arms at the sides and palms forward. The feet point forward, giving anatomy a consistent reference position.
Karta 2
Pytanie
In anatomical language, what does superior mean?
Odpowiedź
Toward the head or above another structure. Inferior means toward the feet or below.
Karta 3
Pytanie
Which anatomical plane divides the body into left and right portions?
Odpowiedź
The sagittal plane. A midsagittal plane divides the body into equal left and right halves.
Karta 4
Pytanie
Why does the body use feedback mechanisms?
Odpowiedź
To regulate internal conditions. Feedback compares a condition with a set range and triggers responses that adjust it.
Karta 5
Pytanie
What is the order of structural organization from simplest to most complex?
Odpowiedź
Chemical, cellular, tissue, organ, organ system, organism. Each level builds on interactions at the preceding level.
Karta 6
Pytanie
What does anterior mean in human anatomy?
Odpowiedź
Toward the front of the body. Posterior means toward the back.
Karta 7
Pytanie
Which plane divides the body into upper and lower portions?
Odpowiedź
The transverse plane. It is also called the horizontal plane.
Karta 8
Pytanie
What is homeostasis?
Odpowiedź
The maintenance of a relatively stable internal environment. It is dynamic rather than perfectly unchanging.
Karta 9
Pytanie
Which major body cavity contains the brain and spinal cord?
Odpowiedź
The dorsal body cavity. Its cranial cavity holds the brain, and its vertebral cavity holds the spinal cord.
Karta 10
Pytanie
What does medial mean in anatomical language?
Odpowiedź
Toward the body's midline. Lateral means farther from the midline.
Karta 11
Pytanie
A rise in body temperature triggers sweating. What control pattern is this?
Odpowiedź
Negative feedback. The response opposes the original temperature change and moves the body toward its normal range.
Karta 12
Pytanie
Which anatomical plane divides the body into front and back portions?
Odpowiedź
The frontal, or coronal, plane. It separates anterior from posterior portions.
Karta 13
Pytanie
Which major body cavity contains the thoracic and abdominopelvic cavities?
Odpowiedź
The ventral body cavity. The diaphragm separates its thoracic and abdominopelvic portions.
Karta 14
Pytanie
What does proximal mean when describing a limb?
Odpowiedź
Closer to the limb's point of attachment. Distal means farther from that point.
Karta 15
Pytanie
How does positive feedback differ from negative feedback?
Odpowiedź
Positive feedback amplifies the initial change. Negative feedback opposes a change; positive feedback continues until a stopping event occurs.
Karta 16
Pytanie
Which tissue type covers surfaces and lines body cavities?
Odpowiedź
Epithelial tissue. It also forms many glands and often serves protective, absorptive, or secretory roles.
Karta 17
Pytanie
Which tissue type mainly supports, binds, and protects other tissues?
Odpowiedź
Connective tissue. Its cells are typically separated by an extracellular matrix.
Karta 18
Pytanie
What shared property lets muscle tissue produce movement?
Odpowiedź
Contractility. Muscle cells shorten or develop tension in response to stimulation.
Karta 19
Pytanie
Which tissue type rapidly communicates by electrical signals?
Odpowiedź
Nervous tissue. Neurons transmit signals, while supporting cells help maintain their environment.
Karta 20
Pytanie
Why are tightly packed epithelial cells well suited for barriers?
Odpowiedź
They leave little space between cells. This continuous arrangement limits passage across a surface.
Karta 21
Pytanie
What distinguishes connective tissue from epithelial tissue?
Odpowiedź
Connective tissue usually has abundant extracellular matrix. Epithelial cells are more tightly packed.
Karta 22
Pytanie
What are the four basic human tissue types?
Odpowiedź
Epithelial, connective, muscle, and nervous tissue. Organs contain two or more tissue types working together.
Karta 23
Pytanie
What makes a structure an organ rather than a tissue?
Odpowiedź
An organ combines multiple tissue types for a specific function. A tissue is a group of similar cells and matrix performing related work.
Karta 24
Pytanie
What are the skeletal system's main functions?
Odpowiedź
Support, protection, movement, mineral storage, blood-cell production, and fat storage. Bones also provide levers for muscles.
Karta 25
Pytanie
What belongs to the axial skeleton?
Odpowiedź
The skull, vertebral column, and thoracic cage. These structures form the body's central axis.
Karta 26
Pytanie
How do compact and spongy bone differ?
Odpowiedź
Compact bone is dense; spongy bone has a lattice of trabeculae. Both are organized living bone tissue.
Karta 27
Pytanie
What is a joint?
Odpowiedź
A place where two or more bones meet. Joint structure determines how much movement is possible.
Karta 28
Pytanie
Which bone cell builds new bone matrix?
Odpowiedź
An osteoblast. Osteoclasts break down bone, while osteocytes maintain mature bone tissue.
Karta 29
Pytanie
What belongs to the appendicular skeleton?
Odpowiedź
The limbs plus the shoulder and pelvic girdles. It attaches the limbs to the axial skeleton.
Karta 30
Pytanie
What is the main role of red bone marrow?
Odpowiedź
Blood-cell production. This process is called hematopoiesis.
Karta 31
Pytanie
Which joint class allows the greatest range of motion?
Odpowiedź
A synovial joint. A fluid-filled joint cavity reduces friction between articulating surfaces.
Karta 32
Pytanie
Which bone cell breaks down bone matrix?
Odpowiedź
An osteoclast. Bone resorption helps remodeling and mineral balance.
Karta 33
Pytanie
What does a ligament connect?
Odpowiedź
Bone to bone. A tendon connects muscle to bone.
Karta 34
Pytanie
What is the shaft of a long bone called?
Odpowiedź
The diaphysis. The enlarged ends are the epiphyses.
Karta 35
Pytanie
Why is bone important to blood-calcium balance?
Odpowiedź
Bone stores calcium and can release or absorb it during remodeling. Hormones regulate this exchange.
Karta 36
Pytanie
What is stored mainly in yellow bone marrow?
Odpowiedź
Fat. It serves as an energy reserve.
Karta 37
Pytanie
What does articular cartilage do at a synovial joint?
Odpowiedź
It reduces friction and absorbs shock. It covers the ends of articulating bones.
Karta 38
Pytanie
Why must a broken bone receive a blood supply during healing?
Odpowiedź
Repairing cells need oxygen and nutrients. Restored blood vessels support fracture healing.
Karta 39
Pytanie
What is bone remodeling?
Odpowiedź
Continuous removal and replacement of bone tissue. It repairs microdamage and helps bones adapt to stress.
Karta 40
Pytanie
Which muscle tissue is usually under voluntary control?
Odpowiedź
Skeletal muscle. Most skeletal muscles move the skeleton, while some, such as facial muscles, insert into skin or other soft tissue.
Karta 41
Pytanie
What is a sarcomere?
Odpowiedź
The basic contractile unit of striated muscle. It lies between two Z discs.
Karta 42
Pytanie
What does a tendon connect?
Odpowiedź
Muscle to bone. It transmits muscle force to the skeleton.
Karta 43
Pytanie
Which proteins slide past one another during muscle contraction?
Odpowiedź
Actin and myosin. Their interaction shortens sarcomeres without shortening the filaments themselves.
Karta 44
Pytanie
Where is smooth muscle commonly found?
Odpowiedź
In the walls of hollow organs and blood vessels. Its contractions are generally involuntary.
Karta 45
Pytanie
What ion exposes binding sites needed for skeletal muscle contraction?
Odpowiedź
Calcium. Its release inside the muscle fiber allows actin and myosin interaction.
Karta 46
Pytanie
How do antagonistic muscle pairs move a joint?
Odpowiedź
One muscle contracts while the opposing muscle relaxes. Reversing their roles moves the joint in the opposite direction.
Karta 47
Pytanie
Why does muscle contraction require ATP?
Odpowiedź
ATP powers cross-bridge cycling and ion pumps. It is also needed for myosin to detach from actin.
Karta 48
Pytanie
Which muscle tissue makes up the heart wall?
Odpowiedź
Cardiac muscle. It is striated, involuntary, and connected for coordinated pumping.
Karta 49
Pytanie
During a typical muscle contraction, which attachment moves more: origin or insertion?
Odpowiedź
The insertion. The origin is generally the more fixed attachment.
Karta 50
Pytanie
Which type of neuron sends the signal that initiates skeletal-muscle contraction?
Odpowiedź
A somatic motor neuron. It releases acetylcholine at the neuromuscular junction, triggering an action potential in the muscle fiber.
Karta 51
Pytanie
What is muscle tone?
Odpowiedź
Continuous low-level muscle tension. It helps maintain posture and readiness without producing a large movement.
Karta 52
Pytanie
How does skeletal muscle help regulate body temperature?
Odpowiedź
Contraction releases heat. Shivering increases rapid contractions when the body is cold.
Karta 53
Pytanie
What are the three muscle tissue types?
Odpowiedź
Skeletal, cardiac, and smooth muscle. They differ in location, structure, and control.
Karta 54
Pytanie
What is a neuron's main function?
Odpowiedź
To receive, process, and transmit information. Neurons use electrical signals and chemical messengers.
Karta 55
Pytanie
What structures make up the central nervous system?
Odpowiedź
The brain and spinal cord. They integrate information and coordinate responses.
Karta 56
Pytanie
Which part of a neuron usually receives incoming signals?
Odpowiedź
The dendrites. The cell body integrates much of that input.
Karta 57
Pytanie
What does the peripheral nervous system include?
Odpowiedź
Nerves and ganglia outside the brain and spinal cord. It links the central nervous system with the rest of the body.
Karta 58
Pytanie
Which neuron structure carries an impulse away from the cell body?
Odpowiedź
The axon. Its terminals communicate with another cell.
Karta 59
Pytanie
Which nervous-system division controls skeletal muscles voluntarily?
Odpowiedź
The somatic nervous system. It also carries sensory information from skin, muscles, and joints.
Karta 60
Pytanie
What is a synapse?
Odpowiedź
A junction where one neuron communicates with another cell. Chemical synapses use neurotransmitters across a small gap.
Karta 61
Pytanie
Which nervous-system division regulates organs and glands without conscious control?
Odpowiedź
The autonomic nervous system. It includes sympathetic and parasympathetic divisions.
Karta 62
Pytanie
How does myelin affect nerve signaling?
Odpowiedź
It speeds impulse conduction along an axon. Myelin insulates segments of the axon.
Karta 63
Pytanie
Which autonomic division prepares the body for acute activity?
Odpowiedź
The sympathetic division. It generally increases alertness and supports a fight-or-flight response.
Karta 64
Pytanie
What is a reflex?
Odpowiedź
A rapid, predictable response to a stimulus. A reflex pathway can act before conscious awareness.
Karta 65
Pytanie
Which autonomic division supports rest, digestion, and energy conservation?
Odpowiedź
The parasympathetic division. It generally promotes routine maintenance functions.
Karta 66
Pytanie
Which brain region is most associated with conscious thought and voluntary movement?
Odpowiedź
The cerebrum. Its cortex also processes much sensory information.
Karta 67
Pytanie
Which brain region fine-tunes balance and coordinated movement?
Odpowiedź
The cerebellum. It compares intended movement with sensory feedback.
Karta 68
Pytanie
Which brain region controls vital automatic functions such as breathing and heart rate?
Odpowiedź
The brainstem. It also connects higher brain regions with the spinal cord.
Karta 69
Pytanie
How do sensory and motor neurons differ?
Odpowiedź
Sensory neurons carry information toward the CNS; motor neurons carry commands away. Interneurons connect and process signals within the CNS.
Karta 70
Pytanie
What does a sensory receptor do?
Odpowiedź
It converts a stimulus into a neural signal. Different receptors respond best to particular forms of energy or chemicals.
Karta 71
Pytanie
What is a hormone?
Odpowiedź
A chemical messenger released into body fluids to affect target cells. A target responds only if it has the appropriate receptor.
Karta 72
Pytanie
Why is the pituitary gland often called a master gland?
Odpowiedź
Several pituitary hormones regulate other endocrine glands. The hypothalamus controls much of pituitary activity.
Karta 73
Pytanie
Why can one hormone affect some cells but not others?
Odpowiedź
Only target cells have the matching receptor. Receptor binding starts the cell's response.
Karta 74
Pytanie
Which gland produces hormones that broadly increase metabolic activity?
Odpowiedź
The thyroid gland. Thyroid hormones influence energy use and development.
Karta 75
Pytanie
What is insulin's main effect on blood glucose?
Odpowiedź
It lowers blood glucose. Insulin promotes glucose uptake and storage after a meal.
Karta 76
Pytanie
Which glands release a hormone that raises blood calcium?
Odpowiedź
The parathyroid glands. Parathyroid hormone acts on bone, kidneys, and vitamin D pathways.
Karta 77
Pytanie
Which adrenal region releases epinephrine during acute stress?
Odpowiedź
The adrenal medulla. Its hormones reinforce sympathetic nervous-system effects.
Karta 78
Pytanie
Which organ has both endocrine and digestive functions?
Odpowiedź
The pancreas. Its islets release hormones, while other cells release digestive enzymes.
Karta 79
Pytanie
What is glucagon's main effect on blood glucose?
Odpowiedź
It raises blood glucose. It promotes release of stored glucose during fasting.
Karta 80
Pytanie
Rising thyroid hormone reduces its own upstream stimulation. What pattern is this?
Odpowiedź
Negative feedback. The final hormone limits further release along the control pathway.
Karta 81
Pytanie
Which adrenal region produces steroid hormones such as cortisol and aldosterone?
Odpowiedź
The adrenal cortex. It surrounds the adrenal medulla.
Karta 82
Pytanie
Which gland releases melatonin and helps regulate daily sleep timing?
Odpowiedź
The pineal gland. Light information influences its secretion pattern.
Karta 83
Pytanie
Which hormone directly increases collecting-duct water permeability?
Odpowiedź
Antidiuretic hormone, or ADH. It makes collecting ducts more permeable to water, increasing water reabsorption and usually producing less, more concentrated urine.
Karta 84
Pytanie
Which hormone strengthens uterine contractions during labor?
Odpowiedź
Oxytocin. This is a classic positive-feedback pathway that ends after delivery.
Karta 85
Pytanie
How does endocrine signaling generally differ from nervous signaling?
Odpowiedź
It is usually slower to start and longer lasting. Hormones travel through body fluids, while neurons signal specific targets rapidly.
Karta 86
Pytanie
What is plasma?
Odpowiedź
The liquid portion of blood. It carries cells, nutrients, hormones, proteins, wastes, and dissolved gases.
Karta 87
Pytanie
Which side of the heart pumps blood to the lungs?
Odpowiedź
The right side. The right ventricle sends deoxygenated blood through the pulmonary trunk and arteries.
Karta 88
Pytanie
What is the main function of red blood cells?
Odpowiedź
Transporting oxygen. Their hemoglobin also carries a smaller share of carbon dioxide.
Karta 89
Pytanie
What defines an artery?
Odpowiedź
It carries blood away from the heart. Oxygen content does not define it; pulmonary arteries carry deoxygenated blood.
Karta 90
Pytanie
What is the main function of white blood cells?
Odpowiedź
Body defense. Different white blood cells recognize, attack, or coordinate responses to threats.
Karta 91
Pytanie
Which side of the heart pumps blood into systemic circulation?
Odpowiedź
The left side. The left ventricle sends oxygenated blood into the aorta.
Karta 92
Pytanie
What is the main purpose of heart valves?
Odpowiedź
To keep blood moving in one direction. Pressure differences open and close them.
Karta 93
Pytanie
What defines a vein?
Odpowiedź
It carries blood toward the heart. Many veins contain valves that limit backflow.
Karta 94
Pytanie
What is the main role of platelets?
Odpowiedź
Helping stop bleeding. They form a platelet plug and support clotting reactions at a damaged vessel.
Karta 95
Pytanie
Why are capillaries well suited for exchange?
Odpowiedź
Their walls are only one cell layer thick. Their small diameter and large total surface area support diffusion and filtration.
Karta 96
Pytanie
After blood enters the right atrium, what chamber receives it next?
Odpowiedź
The right ventricle. Blood passes through the tricuspid valve before entering that chamber.
Karta 97
Pytanie
What happens during ventricular systole?
Odpowiedź
The ventricles contract and eject blood. The right ventricle pumps to the lungs, and the left pumps to the body.
Karta 98
Pytanie
What is pulmonary circulation?
Odpowiedź
Blood flow between the heart and lungs. It allows gas exchange and returns oxygenated blood to the left atrium.
Karta 99
Pytanie
What normally sets the heart's rhythm?
Odpowiedź
The sinoatrial, or SA, node. Its spontaneous electrical activity initiates each heartbeat.
Karta 100
Pytanie
What molecule in red blood cells binds oxygen?
Odpowiedź
Hemoglobin. Its iron-containing heme groups bind oxygen reversibly.
Karta 101
Pytanie
What happens during ventricular diastole?
Odpowiedź
The ventricles relax and fill. Atrioventricular valves are open during most ventricular filling.
Karta 102
Pytanie
What is systemic circulation?
Odpowiedź
Blood flow between the heart and the body's tissues. It delivers oxygen and nutrients and returns wastes.
Karta 103
Pytanie
What does arterial blood pressure measure?
Odpowiedź
The force of blood against artery walls. It is commonly reported as systolic over diastolic pressure.
Karta 104
Pytanie
What do coronary arteries supply?
Odpowiedź
The heart muscle itself. Blocked coronary blood flow can deprive myocardium of oxygen.
Karta 105
Pytanie
Which major vessels return systemic blood to the right atrium?
Odpowiedź
The superior and inferior venae cavae. The superior vessel drains the upper body; the inferior drains the lower body.
Karta 106
Pytanie
What is the respiratory system's primary gas-exchange function?
Odpowiedź
Bringing oxygen into the body and removing carbon dioxide. Ventilation moves air, while diffusion exchanges gases.
Karta 107
Pytanie
What is the airflow sequence from the pharynx to the gas-exchange surfaces?
Odpowiedź
Pharynx, larynx, trachea, bronchi, bronchioles, alveoli. Each branch conducts air deeper into the lungs.
Karta 108
Pytanie
Where does most gas exchange occur in the lungs?
Odpowiedź
Across the alveolar-capillary membrane. Thin walls and a large surface area shorten diffusion distance.
Karta 109
Pytanie
What does the diaphragm do during quiet inhalation?
Odpowiedź
It contracts and moves downward. Thoracic volume rises, lung pressure falls, and air flows inward.
Karta 110
Pytanie
Why does oxygen move from alveoli into pulmonary capillaries?
Odpowiedź
Its partial pressure is higher in alveolar air than in incoming blood. Oxygen diffuses down that gradient.
Karta 111
Pytanie
What drives quiet exhalation?
Odpowiedź
Elastic recoil after inspiratory muscles relax. Thoracic volume falls and pressure pushes air outward.
Karta 112
Pytanie
What is the pleura?
Odpowiedź
A double membrane surrounding each lung. A thin fluid layer reduces friction during breathing.
Karta 113
Pytanie
How is most oxygen transported in blood?
Odpowiedź
Bound to hemoglobin in red blood cells. Only a small amount dissolves directly in plasma.
Karta 114
Pytanie
Why does carbon dioxide move from pulmonary blood into alveoli?
Odpowiedź
Its partial pressure is higher in incoming blood than in alveolar air. It diffuses down that gradient for exhalation.
Karta 115
Pytanie
What helps keep swallowed material out of the airway?
Odpowiedź
The epiglottis and coordinated swallowing reflexes. The laryngeal opening is protected as food passes.
Karta 116
Pytanie
How does the conducting airway remove trapped particles?
Odpowiedź
Mucus traps them, and cilia move the mucus toward the throat. This is the mucociliary escalator.
Karta 117
Pytanie
In what form is most carbon dioxide transported in blood?
Odpowiedź
As bicarbonate ions. Red blood cells help convert carbon dioxide and water into bicarbonate.
Karta 118
Pytanie
Which blood change is a strong normal stimulus to increase breathing?
Odpowiedź
A rise in carbon dioxide and the associated fall in pH. Brainstem centers adjust ventilation in response.
Karta 119
Pytanie
Why must alveoli receive both air and blood?
Odpowiedź
Gas exchange needs ventilation and perfusion. Air without blood flow, or blood without airflow, cannot exchange gases effectively.
Karta 120
Pytanie
Why does ventilation increase during exercise?
Odpowiedź
Active tissues use more oxygen and produce more carbon dioxide. Faster, deeper breathing helps meet that demand.
Karta 121
Pytanie
What are the digestive system's core functions?
Odpowiedź
Ingestion, digestion, absorption, and elimination. Movement and secretion support those processes.
Karta 122
Pytanie
What is the alimentary-canal sequence after the mouth?
Odpowiedź
Pharynx, esophagus, stomach, small intestine, large intestine, rectum, anus. Food passes through this continuous tube.
Karta 123
Pytanie
What is mechanical digestion?
Odpowiedź
Physical breakdown and mixing of food without changing its molecules. Chewing and stomach churning are examples.
Karta 124
Pytanie
What are two major functions of the stomach?
Odpowiedź
It stores and mixes food and begins substantial protein digestion. Acid denatures proteins, converts pepsinogen to pepsin, and provides the low pH pepsin needs.
Karta 125
Pytanie
Where does most nutrient absorption occur?
Odpowiedź
The small intestine. Folds, villi, and microvilli create a large absorptive surface.
Karta 126
Pytanie
Which nutrient does salivary amylase begin digesting in the mouth?
Odpowiedź
Carbohydrates, especially starch. Salivary amylase breaks starch into smaller carbohydrates.
Karta 127
Pytanie
What is chemical digestion?
Odpowiedź
Enzymatic breakdown of large food molecules into absorbable units. Chemical bonds are changed during the process.
Karta 128
Pytanie
What is peristalsis?
Odpowiedź
Wave-like smooth-muscle contractions that move material forward. It occurs throughout much of the digestive tract.
Karta 129
Pytanie
What is a main function of the large intestine?
Odpowiedź
Absorbing water and electrolytes and forming feces. Resident microbes also process some undigested material.
Karta 130
Pytanie
What digestive product does the liver make?
Odpowiedź
Bile. Bile salts help disperse dietary fat into smaller droplets.
Karta 131
Pytanie
What does a digestive sphincter do?
Odpowiedź
It regulates movement between regions of the digestive tract. Circular muscle contracts to close a passage.
Karta 132
Pytanie
What does the pancreas release into the small intestine?
Odpowiedź
Digestive enzymes and bicarbonate-rich fluid. Bicarbonate helps neutralize acidic material from the stomach.
Karta 133
Pytanie
How do intestinal villi improve absorption?
Odpowiedź
They increase surface area. Each villus contains blood capillaries and a lymphatic lacteal for transported nutrients.
Karta 134
Pytanie
What is the gallbladder's role?
Odpowiedź
It stores and concentrates bile. It releases bile into the small intestine when fatty food arrives.
Karta 135
Pytanie
Which macronutrient's absorbed products usually enter intestinal lacteals before reaching the blood?
Odpowiedź
Most dietary lipids. Their absorbed products travel through lymph before entering the bloodstream.
Karta 136
Pytanie
Which accessory organs help digestion without food passing through them?
Odpowiedź
The teeth, tongue, salivary glands, liver, gallbladder, and pancreas. Teeth and the tongue act mechanically; the other accessory organs add or store digestive secretions.
Karta 137
Pytanie
What organs make up the urinary system?
Odpowiedź
The kidneys, ureters, urinary bladder, and urethra. Kidneys make urine; the remaining organs transport, store, and release it.
Karta 138
Pytanie
What is a nephron?
Odpowiedź
The kidney's functional unit. It filters blood and adjusts the filtrate to form urine.
Karta 139
Pytanie
Where does blood filtration begin in a nephron?
Odpowiedź
At the renal corpuscle. Pressure pushes water and small solutes from glomerular capillaries into the capsule.
Karta 140
Pytanie
What moves urine from a kidney to the bladder?
Odpowiedź
A ureter. Smooth-muscle contractions propel urine along the tube.
Karta 141
Pytanie
What is the urinary bladder's main role?
Odpowiedź
Temporary urine storage. Stretch receptors help trigger the urge to urinate as it fills.
Karta 142
Pytanie
Which structure carries urine from the bladder out of the body?
Odpowiedź
The urethra. It is distinct from the ureters that enter the bladder.
Karta 143
Pytanie
What is tubular reabsorption?
Odpowiedź
Movement of useful substances from nephron fluid back into blood. Water, glucose, and ions are common examples.
Karta 144
Pytanie
What is the glomerulus?
Odpowiedź
A capillary tuft that filters blood in the renal corpuscle. Cells and most large proteins normally remain in circulation.
Karta 145
Pytanie
How does more ADH change urine?
Odpowiedź
It makes urine more concentrated and lowers its volume. More water is reabsorbed from the collecting ducts.
Karta 146
Pytanie
What path does filtrate follow after entering the glomerular capsule?
Odpowiedź
Proximal convoluted tubule → nephron loop → distal convoluted tubule → collecting duct. The collecting duct receives forming urine from multiple nephrons.
Karta 147
Pytanie
What is tubular secretion?
Odpowiedź
Movement of selected substances from blood into nephron fluid. It helps eliminate wastes and regulate ions and pH.
Karta 148
Pytanie
Besides removing waste, what does the urinary system regulate?
Odpowiedź
Water, electrolytes, acid-base balance, and blood volume. Kidney hormones also affect blood pressure and red-cell production.
Karta 149
Pytanie
Why does dehydration usually reduce urine volume?
Odpowiedź
The body conserves water by increasing renal reabsorption. ADH is an important signal in this response.
Karta 150
Pytanie
Why do the kidneys receive a large blood flow?
Odpowiedź
They must continuously filter plasma and regulate its composition. High flow supports waste removal and homeostasis.
Karta 151
Pytanie
What is lymph?
Odpowiedź
Interstitial fluid that has entered lymphatic vessels. It eventually returns to the bloodstream.
Karta 152
Pytanie
What is innate immunity?
Odpowiedź
Rapid, nonspecific defense present before a particular exposure. Barriers, inflammation, and several immune cells contribute.
Karta 153
Pytanie
What is a major function of lymph nodes?
Odpowiedź
Filtering lymph and providing sites for immune-cell activation. Swelling can reflect an active immune response.
Karta 154
Pytanie
What does the spleen filter?
Odpowiedź
Blood. It removes aged blood cells and supports immune responses to blood-borne antigens.
Karta 155
Pytanie
What is a key function of B lymphocytes?
Odpowiedź
Producing antibody-secreting cells and memory cells. Antibodies bind specific antigens.
Karta 156
Pytanie
What distinguishes adaptive immunity?
Odpowiedź
It targets specific antigens and develops memory. Later exposure can trigger a faster, stronger response.
Karta 157
Pytanie
Which lymphatic organ is important for T-cell maturation?
Odpowiedź
The thymus. It is most active early in life.
Karta 158
Pytanie
What is the body's first physical barrier against many pathogens?
Odpowiedź
Intact skin and mucous membranes. Their secretions and normal microbes add protection.
Karta 159
Pytanie
What is a key function of T lymphocytes?
Odpowiedź
Coordinating immune responses or killing infected cells. Different T-cell types perform different roles.
Karta 160
Pytanie
What does an antibody bind?
Odpowiedź
A specific antigen. Binding can neutralize a target or mark it for other immune defenses.
Karta 161
Pytanie
What is the purpose of inflammation after tissue injury?
Odpowiedź
To contain damage, recruit defenses, and begin repair. Redness, heat, swelling, and pain can accompany it.
Karta 162
Pytanie
Why is a second adaptive response often faster than the first?
Odpowiedź
Memory lymphocytes remain after the first exposure. They respond quickly when the same antigen appears again.
Karta 163
Pytanie
What does a phagocyte do?
Odpowiedź
It engulfs particles, microbes, or debris. Neutrophils and macrophages are important examples.
Karta 164
Pytanie
How does vaccination support adaptive immunity?
Odpowiedź
It safely exposes the immune system to antigen information. This promotes memory without requiring the full disease.
Karta 165
Pytanie
Why is lymphatic fluid return important?
Odpowiedź
It prevents excess interstitial fluid from accumulating. Lymphatic vessels return fluid and leaked proteins to blood.
Karta 166
Pytanie
What structures belong to the integumentary system?
Odpowiedź
Skin, hair, nails, sweat glands, and sebaceous glands. Together they form the body's outer covering.
Karta 167
Pytanie
What is the epidermis?
Odpowiedź
The outer epithelial layer of skin. It is avascular and contains protective keratinized cells.
Karta 168
Pytanie
How does sweating cool the body?
Odpowiedź
Evaporation removes heat from the skin. Skin blood-flow changes also help regulate heat loss.
Karta 169
Pytanie
What is a major role of melanin in skin?
Odpowiedź
Absorbing some ultraviolet radiation. It also contributes to skin and hair color.
Karta 170
Pytanie
How does skin contribute to sensation?
Odpowiedź
Sensory receptors detect touch, pressure, pain, and temperature. Nerves carry that information to the CNS.
Karta 171
Pytanie
What is the dermis?
Odpowiedź
The connective-tissue layer beneath the epidermis. It contains vessels, nerves, glands, and hair follicles.
Karta 172
Pytanie
How does skin support vitamin D production?
Odpowiedź
Ultraviolet light starts conversion of a skin molecule into a vitamin D precursor. The liver and kidneys complete activation.
Karta 173
Pytanie
Why does a deep skin wound bleed but a shallow epidermal scrape may not?
Odpowiedź
Blood vessels are in the dermis, not the epidermis. A wound must reach vascular tissue to damage them.
Karta 174
Pytanie
What is a gamete?
Odpowiedź
A haploid reproductive cell. Human sperm and oocytes each carry 23 chromosomes.
Karta 175
Pytanie
What are the testes' two main reproductive functions?
Odpowiedź
Producing sperm and secreting testosterone. Sperm develop in seminiferous tubules.
Karta 176
Pytanie
What tube carries sperm from the epididymis toward the ejaculatory duct?
Odpowiedź
The ductus, or vas, deferens. Smooth muscle propels sperm during ejaculation.
Karta 177
Pytanie
What is ovulation?
Odpowiedź
Release of a secondary oocyte from an ovary. A surge in luteinizing hormone helps trigger it.
Karta 178
Pytanie
Where does fertilization usually occur?
Odpowiedź
In a uterine tube. The early embryo then travels toward the uterus.
Karta 179
Pytanie
What are the ovaries' two main reproductive functions?
Odpowiedź
Producing oocytes and secreting sex hormones. Estrogen and progesterone help regulate the reproductive cycle.
Karta 180
Pytanie
What is the uterus' main reproductive role?
Odpowiedź
Supporting implantation and development of an embryo and fetus. Its muscular wall also contracts during birth.
Karta 181
Pytanie
What causes menstruation when pregnancy does not occur?
Odpowiedź
Falling ovarian hormones allow the uterine lining to shed. A new cycle then begins.
Karta 182
Pytanie
How does a sperm cell's structure support its function?
Odpowiedź
Its flagellum provides movement, and its head carries DNA plus enzymes used during fertilization. Mitochondria supply energy in the midpiece.
Karta 183
Pytanie
What is the placenta's exchange role?
Odpowiedź
It allows gases, nutrients, and wastes to move between maternal and fetal circulations. Their blood normally does not mix directly.
Karta 184
Pytanie
Why is meiosis necessary for sexual reproduction?
Odpowiedź
It halves chromosome number in gametes. Fertilization then restores the diploid number.
Karta 185
Pytanie
How do sex hormones regulate reproductive control pathways?
Odpowiedź
They usually feed back on the hypothalamus and pituitary. This adjusts release of hormones that act on the gonads.
Karta 186
Pytanie
What does cell theory state?
Odpowiedź
Living things are made of cells, cells are the basic units of life, and cells come from existing cells. These ideas link organism structure with cell division.
Karta 187
Pytanie
What is the defining structural feature of a prokaryotic cell?
Odpowiedź
It lacks a membrane-bound nucleus. Its DNA occupies a nucleoid region.
Karta 188
Pytanie
What is the cell membrane's main role?
Odpowiedź
Regulating movement between the cell and its environment. Its phospholipid bilayer is selectively permeable.
Karta 189
Pytanie
What is the nucleus' main role?
Odpowiedź
Storing most of a eukaryotic cell's DNA. Nuclear pores regulate exchange with the cytoplasm.
Karta 190
Pytanie
Where are proteins assembled?
Odpowiedź
At ribosomes. Ribosomes may float in cytosol or attach to rough endoplasmic reticulum.
Karta 191
Pytanie
What distinguishes a eukaryotic cell from a prokaryotic cell?
Odpowiedź
A eukaryotic cell has a membrane-bound nucleus and other membrane-bound organelles. Animals, plants, fungi, and protists are eukaryotes.
Karta 192
Pytanie
What is a mitochondrion's main function?
Odpowiedź
Producing most cellular ATP through aerobic respiration. Its inner membrane provides a large reaction surface.
Karta 193
Pytanie
What does rough endoplasmic reticulum mainly produce?
Odpowiedź
Proteins for secretion, membranes, or organelles. Ribosomes on its surface make the proteins.
Karta 194
Pytanie
Which organelle carries out photosynthesis in plants and algae?
Odpowiedź
The chloroplast. It converts light energy into chemical energy stored in organic molecules.
Karta 195
Pytanie
What does the Golgi apparatus do?
Odpowiedź
It modifies, sorts, and packages cell products. Vesicles carry those products to their destinations.
Karta 196
Pytanie
What is a lysosome's role?
Odpowiedź
Digesting worn cell parts and engulfed material. Its enzymes work best in an acidic interior.
Karta 197
Pytanie
What are major functions of smooth endoplasmic reticulum?
Odpowiedź
Lipid synthesis, detoxification, and calcium storage. Its membrane lacks attached ribosomes.
Karta 198
Pytanie
What does the cytoskeleton provide?
Odpowiedź
Cell shape, internal organization, movement, and transport tracks. It is built from protein filaments.
Karta 199
Pytanie
What is diffusion?
Odpowiedź
Net movement from higher to lower concentration. It is passive and continues until dynamic equilibrium is reached.
Karta 200
Pytanie
What happens to an animal cell in a strongly hypotonic solution?
Odpowiedź
Water enters and the cell swells. Without a cell wall, it may burst.
Karta 201
Pytanie
What happens during interphase?
Odpowiedź
The cell grows, performs normal functions, and copies its DNA. Interphase precedes mitotic division.
Karta 202
Pytanie
What is the result of mitosis followed by cytokinesis?
Odpowiedź
Two genetically similar daughter cells. Chromosome number is normally preserved.
Karta 203
Pytanie
What is osmosis?
Odpowiedź
Diffusion of water across a selectively permeable membrane. Water moves toward the side with more nonpenetrating solute.
Karta 204
Pytanie
What happens to an animal cell in a hypertonic solution?
Odpowiedź
Water leaves and the cell shrinks. The external solution has a higher effective solute concentration.
Karta 205
Pytanie
Why are cells generally small?
Odpowiedź
A high surface-area-to-volume ratio supports efficient exchange. Volume grows faster than surface area as a cell enlarges.
Karta 206
Pytanie
What is cytokinesis?
Odpowiedź
Division of the cytoplasm. It separates one cell into two after nuclear division.
Karta 207
Pytanie
How does active transport differ from passive transport?
Odpowiedź
It uses energy to move substances against a gradient. Passive transport moves down a gradient without direct energy input.
Karta 208
Pytanie
What happens to an animal cell in an isotonic solution?
Odpowiedź
There is no net water movement. Water still crosses in both directions at equal rates.
Karta 209
Pytanie
Which structures are typical of plant cells but not animal cells?
Odpowiedź
A cellulose cell wall, chloroplasts, and a large central vacuole. Both cell types have membranes, nuclei, and mitochondria.
Karta 210
Pytanie
How do cells contribute to a multicellular organism's organization?
Odpowiedź
Specialized cells form tissues, tissues form organs, and organs form systems. Division of labor supports complex functions.
Karta 211
Pytanie
What is DNA's primary biological role?
Odpowiedź
Storing hereditary information. Its nucleotide sequence contains instructions used to build functional RNA and proteins.
Karta 212
Pytanie
What are the three parts of a DNA nucleotide?
Odpowiedź
A deoxyribose sugar, a phosphate group, and a nitrogenous base. Nucleotides link to form each strand.
Karta 213
Pytanie
Which bases pair in double-stranded DNA?
Odpowiedź
Adenine with thymine, and cytosine with guanine. Hydrogen bonds hold complementary strands together.
Karta 214
Pytanie
How does RNA differ from DNA?
Odpowiedź
RNA usually has ribose, uses uracil instead of thymine, and is usually single-stranded. Several RNA types help express genes.
Karta 215
Pytanie
What is a gene?
Odpowiedź
A DNA sequence that contributes to a functional product. The product may be a protein or a functional RNA.
Karta 216
Pytanie
What is a chromosome?
Odpowiedź
A long DNA molecule packaged with proteins. It contains many genes and other sequences.
Karta 217
Pytanie
What is DNA replication?
Odpowiedź
Copying DNA before cell division. Each new DNA molecule contains one old strand and one newly made strand.
Karta 218
Pytanie
What is the usual flow of information from a protein-coding gene?
Odpowiedź
DNA to RNA to protein. Transcription makes RNA; translation builds the polypeptide.
Karta 219
Pytanie
What happens during transcription?
Odpowiedź
RNA is synthesized from a DNA template. For a protein-coding gene, that RNA functions as or is processed into messenger RNA.
Karta 220
Pytanie
What does messenger RNA carry?
Odpowiedź
A copy of coding information from DNA to a ribosome. Its codons specify the amino-acid sequence.
Karta 221
Pytanie
What is a codon?
Odpowiedź
A three-nucleotide sequence in mRNA. Most codons specify an amino acid; some signal start or stop.
Karta 222
Pytanie
What is the usual role of the AUG codon?
Odpowiedź
It starts translation and specifies methionine. The ribosome uses it to establish the reading frame.
Karta 223
Pytanie
What happens during translation?
Odpowiedź
A ribosome reads mRNA and joins amino acids into a polypeptide. Transfer RNAs match codons with amino acids.
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Karta 224
Pytanie
What is transfer RNA's role in protein synthesis?
Odpowiedź
It carries an amino acid and matches its anticodon to an mRNA codon. This places the correct amino acid in sequence.
Karta 225
Pytanie
What is an anticodon?
Odpowiedź
A three-base sequence on tRNA complementary to an mRNA codon. Pairing helps decode the message.
Karta 226
Pytanie
What is a mutation?
Odpowiedź
A change in a DNA sequence. Its effect may be harmful, neutral, or beneficial depending on location and context.
Karta 227
Pytanie
Why can a one-base insertion in a coding sequence have a large effect?
Odpowiedź
It can shift the reading frame. Every downstream codon may change until a stop signal appears.
Karta 228
Pytanie
Why can changing one amino acid alter a protein's function?
Odpowiedź
Amino-acid sequence helps determine folding and shape. Shape controls many protein interactions.
Karta 229
Pytanie
What is ribosomal RNA's role in protein synthesis?
Odpowiedź
It forms the structural and catalytic core of ribosomes. Ribosomal RNA helps align translation components and catalyzes peptide-bond formation.
Karta 230
Pytanie
Why can different cell types contain the same DNA but perform different jobs?
Odpowiedź
They express different sets of genes. Different proteins give cells different structures and functions.
Karta 231
Pytanie
Which mutation can be passed to offspring?
Odpowiedź
A mutation present in a gamete-forming lineage. A mutation limited to ordinary body cells is not inherited through reproduction.
Karta 232
Pytanie
What is an allele?
Odpowiedź
An alternative version of a gene. Diploid individuals usually carry two alleles for each autosomal gene.
Karta 233
Pytanie
What is genotype?
Odpowiedź
An organism's allele combination for a gene or set of genes. Genotype contributes to phenotype.
Karta 234
Pytanie
What does homozygous mean?
Odpowiedź
Having two identical alleles for a gene. Examples include AA and aa.
Karta 235
Pytanie
What makes an allele dominant in a simple Mendelian trait?
Odpowiedź
One copy is enough for its phenotype to appear in a heterozygote. Dominant does not mean common or beneficial.
Karta 236
Pytanie
What does Mendel's law of segregation describe?
Odpowiedź
The two alleles for a gene separate during gamete formation. Each gamete receives one allele.
Karta 237
Pytanie
What is phenotype?
Odpowiedź
An observable trait or characteristic. It can reflect genotype, environment, and their interaction.
Karta 238
Pytanie
What does heterozygous mean?
Odpowiedź
Having two different alleles for a gene. An example is Aa.
Karta 239
Pytanie
When does a recessive phenotype usually appear in a simple autosomal trait?
Odpowiedź
When both alleles are recessive. A heterozygote carries the allele without showing that phenotype.
Karta 240
Pytanie
When does independent assortment apply most clearly?
Odpowiedź
When genes are on different chromosomes or far apart on the same chromosome. Their allele pairs enter gametes independently.
Karta 241
Pytanie
What does a Punnett square predict?
Odpowiedź
Expected offspring genotype probabilities from specified parental gametes. It does not guarantee outcomes in a small family.
Karta 242
Pytanie
For Aa × Aa, what is the chance of an aa offspring?
Odpowiedź
One fourth, or 25%. The genotype ratio is expected to be 1 AA : 2 Aa : 1 aa.
Karta 243
Pytanie
For Aa × Aa with complete dominance, what phenotypic ratio is expected?
Odpowiedź
Three dominant-phenotype offspring to one recessive-phenotype offspring. This is a probability across many offspring.
Karta 244
Pytanie
How can a test cross reveal the genotype behind a dominant phenotype?
Odpowiedź
Cross the individual with a homozygous recessive partner. Recessive offspring show that the unknown parent carried a recessive allele.
Karta 245
Pytanie
What happens in incomplete dominance?
Odpowiedź
A heterozygote has an intermediate phenotype. Neither allele fully masks the other.
Karta 246
Pytanie
How is the probability of two independent genetic events both occurring found?
Odpowiedź
Multiply their individual probabilities. This is the product rule.
Karta 247
Pytanie
What does a pedigree show?
Odpowiedź
How a trait appears across generations of a family. Its pattern can suggest a mode of inheritance.
Karta 248
Pytanie
Why can two parents have offspring ratios that differ from a Punnett-square expectation?
Odpowiedź
Each fertilization is a chance event. Expected ratios become more apparent with larger numbers of offspring.
Karta 249
Pytanie
What happens in codominance?
Odpowiedź
Both alleles are distinctly expressed in a heterozygote. The AB blood type is a common example.
Karta 250
Pytanie
What are major roles of carbohydrates?
Odpowiedź
Providing quick energy, storing energy, and forming some structures. Monosaccharides are their basic building blocks.
Karta 251
Pytanie
What is a monomer?
Odpowiedź
A small building block that can join with others to form a larger molecule. Glucose, amino acids, and nucleotides are examples in different classes.
Karta 252
Pytanie
What happens in a dehydration-synthesis reaction?
Odpowiedź
Monomers join while water is removed. The reaction builds a larger biological molecule.
Karta 253
Pytanie
What does an enzyme do?
Odpowiedź
It lowers activation energy and speeds a reaction without being consumed. Its shape helps it bind specific substrates.
Karta 254
Pytanie
What are major roles of lipids?
Odpowiedź
Long-term energy storage, membranes, insulation, and signaling. Lipids are mostly nonpolar and do not mix well with water.
Karta 255
Pytanie
What does it mean for a protein to denature?
Odpowiedź
Its normal shape is disrupted. Heat, extreme pH, or chemicals can reduce its function.
Karta 256
Pytanie
What happens during hydrolysis?
Odpowiedź
Water is used to split a larger molecule into smaller units. Digestion often uses hydrolysis reactions.
Karta 257
Pytanie
Why do phospholipids form bilayers in water?
Odpowiedź
Their hydrophilic heads interact with water while hydrophobic tails turn inward. This arrangement forms cell-membrane structure.
Karta 258
Pytanie
What are proteins built from?
Odpowiedź
Amino acids linked by peptide bonds. Their folded shapes support enzymes, transport, signaling, structure, and movement.
Karta 259
Pytanie
How do starch and glycogen compare?
Odpowiedź
Both store glucose; plants use starch and animals use glycogen. Their branching patterns differ.
Karta 260
Pytanie
How do saturated and unsaturated fatty acids differ?
Odpowiedź
Saturated fatty acids lack carbon-carbon double bonds; unsaturated ones have one or more. Double bonds often introduce bends.
Karta 261
Pytanie
What immediate energy-carrying molecule powers many cell processes?
Odpowiedź
ATP. Energy released from nutrients can be transferred into ATP's phosphate bonds.
Karta 262
Pytanie
What are nucleic acids built from?
Odpowiedź
Nucleotides. DNA stores hereditary information, while RNA performs several roles in gene expression.
Karta 263
Pytanie
Which elements are common in all four major biological macromolecule classes?
Odpowiedź
Carbon, hydrogen, and oxygen. Nitrogen and phosphorus occur prominently in some classes.
Karta 264
Pytanie
Why is three-dimensional shape important for macromolecules?
Odpowiedź
Shape determines many interactions and functions. A changed shape can prevent a molecule from binding its target.
Karta 265
Pytanie
What are triglycerides built from?
Odpowiedź
One glycerol molecule and three fatty acids. They join through ester bonds to form a common energy-storage lipid.
Karta 266
Pytanie
What is a pathogen?
Odpowiedź
An agent capable of causing disease. Not every microorganism is pathogenic.
Karta 267
Pytanie
What type of cell is a bacterium?
Odpowiedź
A prokaryotic cell. Bacteria usually reproduce by binary fission.
Karta 268
Pytanie
What cell type do fungi have?
Odpowiedź
Eukaryotic cells. Some fungi are unicellular yeasts, while others form multicellular filaments.
Karta 269
Pytanie
What does disease transmission describe?
Odpowiedź
How an infectious agent moves to a susceptible host. Routes include contact, droplets, airborne spread, food, water, and vectors.
Karta 270
Pytanie
What is a biological vector?
Odpowiedź
An organism that becomes infected with a pathogen and transmits it between hosts. The pathogen survives or reproduces inside the vector, unlike transport by a mechanical carrier.
Karta 271
Pytanie
Why are viruses dependent on host cells?
Odpowiedź
They lack the complete machinery for reproduction and metabolism. They use host components to make new virus particles.
Karta 272
Pytanie
What is a protist?
Odpowiedź
A diverse eukaryote that is not classified as an animal, plant, or fungus. Some protists cause disease, while many do not.
Karta 273
Pytanie
Why do antibiotics not treat viral infections?
Odpowiedź
They target bacterial structures or processes that viruses lack. Antiviral drugs use different targets.
Karta 274
Pytanie
How can normal microbiota protect a host?
Odpowiedź
They occupy space and use resources that pathogens might otherwise exploit. Some also support digestion or immune development.
Karta 275
Pytanie
How does sterilization differ from disinfection?
Odpowiedź
Sterilization destroys or removes all microbial life, including resistant forms; disinfection reduces pathogens on objects. The required method depends on use.
Karta 276
Pytanie
How do infection and disease differ?
Odpowiedź
Infection means an agent is established in a host; disease means normal function is impaired and signs or symptoms occur. Infection may be asymptomatic.
Karta 277
Pytanie
How can breaking a transmission route reduce infectious disease?
Odpowiedź
It interrupts the chain connecting a source with a susceptible host. Hand hygiene, clean water, ventilation, and vector control target different links.
Karta 278
Pytanie
What is an atom?
Odpowiedź
The smallest unit of an element that retains that element's chemical identity. Atoms contain a nucleus surrounded by electrons.
Karta 279
Pytanie
What charge and location does an electron have?
Odpowiedź
Negative charge in the electron cloud around the nucleus. Electrons drive most chemical bonding.
Karta 280
Pytanie
Why are valence electrons important?
Odpowiedź
They participate most directly in bonding and reactions. Their arrangement helps predict chemical behavior.
Karta 281
Pytanie
What do elements in the same periodic-table group often share?
Odpowiedź
Similar valence-electron patterns and chemical properties. A group is a vertical column.
Karta 282
Pytanie
What is an ion?
Odpowiedź
An atom or group of atoms with a net electric charge. Its total numbers of protons and electrons are unequal.
Karta 283
Pytanie
What charge and location does a proton have?
Odpowiedź
Positive charge in the nucleus. The number of protons determines the element.
Karta 284
Pytanie
What does an element's atomic number equal?
Odpowiedź
Its number of protons. A neutral atom has the same number of electrons.
Karta 285
Pytanie
How does a neutral atom form a cation?
Odpowiedź
By losing one or more electrons. It has more protons than electrons and a positive charge.
Karta 286
Pytanie
An atom has 8 protons. How many electrons does it have if it is neutral?
Odpowiedź
Eight electrons. Neutral atoms have equal positive and negative charges.
Karta 287
Pytanie
What charge and location does a neutron have?
Odpowiedź
No electric charge, in the nucleus. Neutron number can vary among isotopes of an element.
Karta 288
Pytanie
What does mass number equal?
Odpowiedź
Protons plus neutrons in one atom. It is a whole number for a specific isotope.
Karta 289
Pytanie
How does a neutral atom form an anion?
Odpowiedź
By gaining one or more electrons. It has more electrons than protons and a negative charge.
Karta 290
Pytanie
What does a period represent on the periodic table?
Odpowiedź
A horizontal row. Moving across a period changes proton number one element at a time.
Karta 291
Pytanie
What are isotopes?
Odpowiedź
Atoms of the same element with different numbers of neutrons. They have the same atomic number but different mass numbers.
Karta 292
Pytanie
What is matter?
Odpowiedź
Anything that has mass and occupies space. Solids, liquids, gases, and plasma are forms of matter.
Karta 293
Pytanie
What distinguishes a solid from a liquid or gas?
Odpowiedź
A solid has a definite shape and volume. Its particles vibrate around relatively fixed positions.
Karta 294
Pytanie
What is a physical change?
Odpowiedź
A change in form or state without changing chemical identity. Melting and cutting are examples.
Karta 295
Pytanie
What is a physical property?
Odpowiedź
A characteristic observed without changing a substance's identity. Density, color, and melting point are examples.
Karta 296
Pytanie
How does an element differ from a compound?
Odpowiedź
An element contains one kind of atom; a compound contains elements chemically combined in fixed proportions. Chemical methods can separate a compound into simpler substances.
Karta 297
Pytanie
What distinguishes a liquid?
Odpowiedź
It has a definite volume but takes the shape of its container. Its particles remain close while moving past one another.
Karta 298
Pytanie
What is a chemical change?
Odpowiedź
A process that forms one or more substances with new chemical identities. Bond rearrangement occurs.
Karta 299
Pytanie
What is a chemical property?
Odpowiedź
A substance's ability to undergo a particular chemical change. Flammability and reactivity with acid are examples.
Karta 300
Pytanie
Which phase changes connect solids and liquids?
Odpowiedź
Melting changes a solid to a liquid; freezing changes a liquid to a solid. These are opposite physical changes.
Karta 301
Pytanie
How does a pure substance differ from a mixture?
Odpowiedź
A pure substance has a fixed composition and is an element or compound; a mixture has variable composition and physically combined components. Mixture components retain their identities.
Karta 302
Pytanie
What distinguishes a gas?
Odpowiedź
It has neither a definite shape nor a definite volume. It expands to fill its container.
Karta 303
Pytanie
What is the formula for density?
Odpowiedź
Density = mass ÷ volume. Density is an intensive property.
Karta 304
Pytanie
Which phase changes connect liquids and gases?
Odpowiedź
Vaporization changes a liquid to a gas; condensation changes a gas to a liquid. Evaporation is vaporization at a liquid's surface.
Karta 305
Pytanie
What is a mixture?
Odpowiedź
Two or more substances physically combined in variable proportions. Its components retain their chemical identities.
Karta 306
Pytanie
How do intensive and extensive properties differ?
Odpowiedź
Intensive properties do not depend on sample amount; extensive properties do. Density and temperature are intensive, while mass and volume are extensive.
Karta 307
Pytanie
A 20 g sample occupies 5 mL. What is its density?
Odpowiedź
4 g/mL. Divide 20 g by 5 mL.
Karta 308
Pytanie
Which phase changes connect solids and gases directly?
Odpowiedź
Sublimation changes a solid to a gas; deposition changes a gas to a solid. Neither transition passes through the liquid state.
Karta 309
Pytanie
How do homogeneous and heterogeneous mixtures differ?
Odpowiedź
A homogeneous mixture is uniform throughout; a heterogeneous mixture is not. A solution is homogeneous.
Karta 310
Pytanie
Where are reactants and products written in a chemical equation?
Odpowiedź
Reactants are on the left; products are on the right. The arrow shows the direction represented.
Karta 311
Pytanie
Why must a chemical equation be balanced?
Odpowiedź
Atoms are conserved in ordinary chemical reactions. Each element must have the same atom count on both sides.
Karta 312
Pytanie
What does a coefficient in a chemical equation change?
Odpowiedź
The number of whole particles or moles represented. It multiplies every atom in the following formula.
Karta 313
Pytanie
Why should subscripts not be changed when balancing an equation?
Odpowiedź
Changing a subscript changes the substance's identity. Balancing changes coefficients only.
Karta 314
Pytanie
What coefficients balance H₂ + O₂ → H₂O?
Odpowiedź
2, 1, 2: 2H₂ + O₂ → 2H₂O. Both sides then contain four hydrogen atoms and two oxygen atoms.
Karta 315
Pytanie
What pattern defines a synthesis reaction?
Odpowiedź
Two or more reactants form a more complex product. A general pattern is A + B → AB.
Karta 316
Pytanie
What are typical products when a hydrocarbon burns completely in oxygen?
Odpowiedź
Carbon dioxide and water. Incomplete combustion can produce carbon monoxide or carbon.
Karta 317
Pytanie
What is the net ionic equation for a typical strong acid–strong base neutralization?
Odpowiedź
H⁺(aq) + OH⁻(aq) → H₂O(l). The remaining ions are spectators and do not appear in the net ionic equation.
Karta 318
Pytanie
What is a precipitate?
Odpowiedź
An insoluble solid that forms from substances in solution. Its appearance can signal a chemical reaction.
Karta 319
Pytanie
What pattern defines a decomposition reaction?
Odpowiedź
One compound breaks into simpler products. A general pattern is AB → A + B.
Karta 320
Pytanie
What is an exothermic reaction?
Odpowiedź
A reaction that releases heat to the surroundings. The surroundings often warm.
Karta 321
Pytanie
What occurs in an oxidation-reduction reaction?
Odpowiedź
Electrons transfer or atoms change oxidation state. Oxidation is electron loss; reduction is electron gain.
Karta 322
Pytanie
What is activation energy?
Odpowiedź
The minimum energy barrier reactants must overcome to react. Catalysts lower this barrier.
Karta 323
Pytanie
Which observations can provide evidence of a chemical reaction?
Odpowiedź
Gas formation, a precipitate, sustained color change, light, or temperature change. No single sign proves a reaction without context.
Karta 324
Pytanie
What is an endothermic reaction?
Odpowiedź
A reaction that absorbs heat from the surroundings. The surroundings may cool.
Karta 325
Pytanie
Why does raising temperature usually speed a reaction?
Odpowiedź
Particles collide more often and with greater energy. More collisions overcome activation energy.
Karta 326
Pytanie
Why can higher reactant concentration increase reaction rate?
Odpowiedź
More reactant particles occupy a given volume. This raises collision frequency.
Karta 327
Pytanie
Why does powdered solid often react faster than one large piece?
Odpowiedź
Powder exposes more surface area. More particles are available for collisions.
Karta 328
Pytanie
How does a catalyst speed a reaction?
Odpowiedź
It provides a pathway with lower activation energy. The catalyst is regenerated rather than consumed overall.
Karta 329
Pytanie
How can increasing pressure affect a reaction between gases?
Odpowiedź
It can increase rate by bringing gas particles closer together. Collision frequency rises when volume falls.
Karta 330
Pytanie
What does a reaction inhibitor do?
Odpowiedź
It slows a reaction. It may block a pathway, interfere with a catalyst, or remove reactive intermediates.
Karta 331
Pytanie
Why can very high temperature slow an enzyme-catalyzed reaction?
Odpowiedź
The enzyme can denature and lose its active shape. Moderate warming helps only within the enzyme's stable range.
Karta 332
Pytanie
What is dynamic equilibrium?
Odpowiedź
Forward and reverse reactions continue at equal rates. Concentrations remain constant even though particles still react.
Karta 333
Pytanie
Does a catalyst change the final equilibrium amounts?
Odpowiedź
No. It speeds forward and reverse reactions, so equilibrium is reached sooner without changing its position.
Karta 334
Pytanie
At equilibrium, what usually happens when the concentration of a dissolved or gaseous reactant increases?
Odpowiedź
The system shifts toward consuming some added reactant. It forms more product until a new equilibrium is reached.
Karta 335
Pytanie
What is a solution?
Odpowiedź
A homogeneous mixture. Its components are uniformly distributed at the molecular or ionic level.
Karta 336
Pytanie
How do solute and solvent differ?
Odpowiedź
The solute is dissolved; the solvent is the dissolving medium. The solvent is often present in greater amount.
Karta 337
Pytanie
What does aqueous mean in chemistry?
Odpowiedź
Dissolved in water. The symbol (aq) marks an aqueous species in an equation.
Karta 338
Pytanie
What does concentration describe?
Odpowiedź
The amount of solute in a given amount of solution or solvent. Different units express it in different ways.
Karta 339
Pytanie
What is molarity?
Odpowiedź
Moles of solute per liter of solution. Its unit is mol/L, written M.
Karta 340
Pytanie
What is the molarity of 0.50 mol solute in 2.0 L of solution?
Odpowiedź
0.25 M. Divide 0.50 mol by 2.0 L.
Karta 341
Pytanie
What stays constant when water is added to dilute a solution without reaction?
Odpowiedź
The moles of solute. Volume increases and concentration decreases.
Karta 342
Pytanie
Which equation relates concentration and volume before and after a dilution?
Odpowiedź
M₁V₁ = M₂V₂. It follows from conserving the amount of solute.
Karta 343
Pytanie
What is solubility?
Odpowiedź
The maximum concentration of a solute that can be achieved in a solution at equilibrium under specified conditions. Temperature and the substances involved matter.
Karta 344
Pytanie
What is a saturated solution?
Odpowiedź
A solution holding the maximum dissolved solute at those conditions. Extra solute remains undissolved at equilibrium.
Karta 345
Pytanie
What is an electrolyte?
Odpowiedź
A substance that produces mobile ions in solution and conducts electricity. Soluble ionic compounds are common examples.
Karta 346
Pytanie
What does 'like dissolves like' predict?
Odpowiedź
Substances with similar polarity tend to mix well. Polar solvents favor polar or ionic solutes; nonpolar solvents favor nonpolar solutes.
Karta 347
Pytanie
Does heating always increase solubility?
Odpowiedź
No. Many solids become more soluble in water, but gases usually become less soluble as temperature rises.
Karta 348
Pytanie
What is an unsaturated solution?
Odpowiedź
A solution that can dissolve more solute at the stated conditions. It is below the solubility limit.
Karta 349
Pytanie
What does a Brønsted-Lowry acid donate?
Odpowiedź
A proton, H⁺. In water, acid behavior increases hydronium-ion concentration.
Karta 350
Pytanie
What does pH describe?
Odpowiedź
The hydronium-ion concentration on a logarithmic scale. Lower pH means higher hydronium concentration.
Karta 351
Pytanie
At 25 °C, what pH range is acidic?
Odpowiedź
Below 7. A neutral aqueous solution is pH 7 at this temperature.
Karta 352
Pytanie
How does hydronium concentration change when pH drops by 1 unit?
Odpowiedź
It increases tenfold. The pH scale is logarithmic.
Karta 353
Pytanie
What does a Brønsted-Lowry base accept?
Odpowiedź
A proton, H⁺. Many bases in water also increase hydroxide-ion concentration.
Karta 354
Pytanie
At 25 °C, what is the relationship between pH and pOH?
Odpowiedź
pH + pOH = 14. pOH is the negative base-10 logarithm of hydroxide-ion concentration; this relation applies to aqueous solutions at 25 °C.
Karta 355
Pytanie
At 25 °C, what pH range is basic?
Odpowiedź
Above 7. Basic solutions have less hydronium and more hydroxide than neutral water.
Karta 356
Pytanie
What are typical products of a strong acid reacting with a strong base?
Odpowiedź
Water and an ionic salt. Hydrogen ions and hydroxide ions combine to form water.
Karta 357
Pytanie
What does strong mean for an acid or base?
Odpowiedź
It produces its characteristic ions essentially completely in water. Strong acids ionize; soluble ionic strong bases dissociate. Strength is separate from concentration.
Karta 358
Pytanie
What does a buffer do?
Odpowiedź
It resists large pH changes when small amounts of acid or base are added. A weak conjugate acid-base pair neutralizes much of the added H₃O⁺ or OH⁻.
Karta 359
Pytanie
How does an acid-base indicator work?
Odpowiedź
Its color depends on pH. The change occurs over a characteristic pH range.
Karta 360
Pytanie
A solution has pH 9 at 25 °C. What is its pOH?
Odpowiedź
5. Subtract the pH from 14.
Karta 361
Pytanie
How does a concentrated weak acid differ from a dilute strong acid?
Odpowiedź
Concentration tells how much acid is present; strength tells how completely it ionizes. A concentrated weak acid contains more partially ionizing acid, while a dilute strong acid contains less acid that ionizes essentially completely. Either can have the lower pH.
Karta 362
Pytanie
What is the SI base unit of length?
Odpowiedź
The meter (m). Centimeters and millimeters are decimal subdivisions of a meter.
Karta 363
Pytanie
Which tool directly measures mass in a laboratory?
Odpowiedź
A balance. A spring scale measures force, often reported as weight.
Karta 364
Pytanie
What is the SI base unit of mass?
Odpowiedź
The kilogram (kg). Laboratory mass is also commonly reported in grams.
Karta 365
Pytanie
A student needs to measure about 35 mL of liquid and can choose a beaker or graduated cylinder. Which should they use?
Odpowiedź
A graduated cylinder. Read the scale at eye level.
Karta 366
Pytanie
What is the SI base unit of time?
Odpowiedź
The second (s). Minutes and hours are accepted for many everyday uses.
Karta 367
Pytanie
Where should the volume of a clear water-based liquid be read in a graduated cylinder?
Odpowiedź
At the bottom of the meniscus. Keep your eye level with the liquid surface.
Karta 368
Pytanie
What is the SI base unit of thermodynamic temperature?
Odpowiedź
The kelvin (K). Degrees Celsius are widely used for laboratory and body temperatures.
Karta 369
Pytanie
Which tool measures temperature?
Odpowiedź
A thermometer. Its range and resolution should match the task.
Karta 370
Pytanie
What factor does the metric prefix kilo- represent?
Odpowiedź
One thousand, or 10³. One kilometer equals 1,000 meters.
Karta 371
Pytanie
A ruler's smallest marking is 1 mm. To what place should a careful analog reading usually be estimated?
Odpowiedź
One place beyond the smallest marking, when the scale allows it. The final digit is uncertain.
Karta 372
Pytanie
What is measurement accuracy?
Odpowiedź
Closeness to an accepted or true value. A systematic error can make precise measurements inaccurate.
Karta 373
Pytanie
How do mass and weight differ?
Odpowiedź
Mass is the amount of matter; weight is gravitational force on that mass. Mass stays constant when gravity changes, but weight does not.
Karta 374
Pytanie
What factor does the metric prefix milli- represent?
Odpowiedź
One thousandth, or 10⁻³. One milliliter is 0.001 liter.
Karta 375
Pytanie
How can the volume of an irregular solid be measured with water?
Odpowiedź
Use water displacement. Subtract the initial water volume from the final volume after submerging the object.
Karta 376
Pytanie
What is measurement precision?
Odpowiedź
Closeness of repeated measurements to one another. Precise results can still be consistently wrong.
Karta 377
Pytanie
What is an instrument's resolution?
Odpowiedź
The smallest change it can meaningfully display or distinguish. Higher resolution does not automatically guarantee accuracy.
Karta 378
Pytanie
How many centimeters are in 2.5 meters?
Odpowiedź
2.5 × 10² cm (250 cm). Multiply meters by the exact conversion factor 100 cm/m.
Karta 379
Pytanie
Why must a numerical measurement include a unit?
Odpowiedź
The unit identifies the quantity's scale. A bare number is ambiguous and cannot be compared reliably.
Karta 380
Pytanie
What is a scientific observation?
Odpowiedź
Information recorded with senses or instruments. It should be distinguished from an explanation of what was observed.
Karta 381
Pytanie
What makes a hypothesis scientifically useful?
Odpowiedź
It is testable and falsifiable. Evidence must be able to count against it.
Karta 382
Pytanie
What is a scientific theory?
Odpowiedź
A broad, well-supported explanation of natural phenomena. It is not a casual guess and can be revised with new evidence.
Karta 383
Pytanie
Which claim is falsifiable: 'No possible observation could count against this treatment's effectiveness' or 'This treatment lowers mean temperature within one hour'?
Odpowiedź
The claim that the treatment lowers mean temperature within one hour. An observation could count against it, so evidence can test it.
Karta 384
Pytanie
What is an inference?
Odpowiedź
A logical interpretation based on observations and prior knowledge. It goes beyond the raw measurement.
Karta 385
Pytanie
How does a prediction relate to a hypothesis?
Odpowiedź
It states an expected result if the hypothesis is correct. Experiments compare observed results with that expectation.
Karta 386
Pytanie
How does a scientific law differ from a scientific theory?
Odpowiedź
A law describes a consistent pattern; a theory explains how or why patterns occur. One does not mature into the other.
Karta 387
Pytanie
What does reliability mean for a measurement or procedure?
Odpowiedź
It produces consistent results under the same conditions. Repetition helps assess reliability.
Karta 388
Pytanie
What does a correlation show?
Odpowiedź
Two variables change together in a patterned way. Correlation alone does not establish that one causes the other.
Karta 389
Pytanie
What is bias in scientific work?
Odpowiedź
A systematic influence that pushes observations, selection, or interpretation in one direction. Good design tries to prevent or measure it.
Karta 390
Pytanie
What is the purpose of scientific peer review?
Odpowiedź
Independent experts evaluate methods, reasoning, and reporting before publication. It improves scrutiny but does not guarantee truth.
Karta 391
Pytanie
What does validity ask about a study or measurement?
Odpowiedź
Whether it measures or tests what it claims to measure or test. Consistency alone does not ensure validity.
Karta 392
Pytanie
What evidence most strengthens a causal claim?
Odpowiedź
A well-controlled experiment that manipulates the suspected cause. Random assignment reduces confounding, while independent replication tests whether the result holds with new data.
Karta 393
Pytanie
What is a primary scientific source?
Odpowiedź
A report of original methods, data, and results. A review article synthesizes many primary studies.
Karta 394
Pytanie
How should an unexpected outlier be handled?
Odpowiedź
Investigate and report it rather than deleting it automatically. Exclusion needs a documented scientific reason.
Karta 395
Pytanie
What is a confounding variable?
Odpowiedź
An outside factor related to both the suspected cause and the outcome. It can create a misleading association.
Karta 396
Pytanie
Why should a sample represent the population of interest?
Odpowiedź
Results generalize poorly when important groups are missing or overrepresented. Sampling method matters as much as size.
Karta 397
Pytanie
What is a scientific model?
Odpowiedź
A simplified representation used to explain or predict a system. A model is useful within its assumptions and limits.
Karta 398
Pytanie
Why should measurements report uncertainty or reasonable precision?
Odpowiedź
Every measurement has limits. Reporting more digits than the method supports creates false precision.
Karta 399
Pytanie
If results match a prediction once, what is the safest conclusion?
Odpowiedź
The results support the hypothesis under those conditions. One result does not prove the hypothesis in every setting.
Karta 400
Pytanie
What is a direct relationship between two variables?
Odpowiedź
As one increases, the other tends to increase; as one decreases, the other tends to decrease. The relationship need not be perfectly linear.
Karta 401
Pytanie
Which variable is usually placed on the x-axis of an experimental graph?
Odpowiedź
The independent variable. It is the factor selected or changed by the investigator.
Karta 402
Pytanie
What does the slope of a straight-line graph represent?
Odpowiedź
Change in y divided by change in x. It is the response rate per unit change in the other variable.
Karta 403
Pytanie
A line rises 12 units in y while x rises 3 units. What is its slope?
Odpowiedź
4 units of y per unit of x. Divide 12 by 3.
Karta 404
Pytanie
What is an inverse relationship?
Odpowiedź
As one variable increases, the other tends to decrease. Their product is constant only in a strictly inverse proportion.
Karta 405
Pytanie
Which variable is usually placed on the y-axis of an experimental graph?
Odpowiedź
The dependent variable. It is the measured response.
Karta 406
Pytanie
What does a plateau on a response graph indicate?
Odpowiedź
The measured response has stopped changing much despite further x increases. A limiting factor may have been reached.
Karta 407
Pytanie
What is interpolation?
Odpowiedź
Estimating a value within the range of measured data. It is generally safer than extrapolating beyond that range.
Karta 408
Pytanie
What pattern suggests no relationship between two plotted variables?
Odpowiedź
The response shows no consistent change as the other variable changes. Points may scatter without a trend.
Karta 409
Pytanie
Before comparing values in a data table, what should you check?
Odpowiedź
Headings, units, and conditions. Numbers from different measures or scales cannot be compared directly.
Karta 410
Pytanie
If 3 samples require 12 mL total, how much is needed for 5 equal samples?
Odpowiedź
20 mL. The rate is 4 mL per sample, so multiply by 5.
Karta 411
Pytanie
How is the arithmetic mean calculated?
Odpowiedź
Add all values and divide by the number of values. A large outlier can shift the mean.
Karta 412
Pytanie
Why is extrapolation uncertain?
Odpowiedź
It assumes the observed trend continues outside measured conditions. The relationship may change beyond the data range.
Karta 413
Pytanie
A culture grows from 20 to 50 cells in 6 hours. What is the average growth rate?
Odpowiedź
5 cells per hour. The change is 30 cells divided by 6 hours.
Karta 414
Pytanie
A measurement rises from 40 to 50. What is the percent increase?
Odpowiedź
25%. The increase is 10, and 10 ÷ 40 × 100 = 25%.
Karta 415
Pytanie
When can the median describe a typical value better than the mean?
Odpowiedź
When data are skewed or contain strong outliers. In an ordered set, the median is the middle value for an odd count and the mean of the two middle values for an even count.
Karta 416
Pytanie
How do quantitative and qualitative data differ?
Odpowiedź
Quantitative data are numerical; qualitative data describe categories or qualities. Both can answer scientific questions.
Karta 417
Pytanie
A response is 2 at dose 1, 4 at dose 2, and 8 at dose 4. If the relationship is linear, what response is predicted at dose 3?
Odpowiedź
6. The observed rate is 2 response units per dose unit, so interpolation at dose 3 gives 6.
Karta 418
Pytanie
How can a graph reveal a nonlinear relationship?
Odpowiedź
The points follow a curve rather than a straight line. The rate of change varies across the x-range.
Karta 419
Pytanie
What is the range of a data set?
Odpowiedź
Maximum minus minimum. It describes total spread but ignores the distribution between the endpoints.
Karta 420
Pytanie
What makes a scientific research question testable?
Odpowiedź
It identifies measurable variables or observable outcomes. The needed data must be obtainable.
Karta 421
Pytanie
In an experiment, what is the independent variable?
Odpowiedź
The factor deliberately changed or assigned by the investigator. In a simple one-factor experiment, changing one independent variable helps isolate its effect.
Karta 422
Pytanie
What should a hypothesis connect?
Odpowiedź
A proposed explanation with a measurable outcome. It should lead to a prediction that evidence can challenge.
Karta 423
Pytanie
What is a controlled variable, or constant?
Odpowiedź
A condition kept the same across groups. Holding it constant prevents it from explaining outcome differences.
Karta 424
Pytanie
What is the purpose of a control group?
Odpowiedź
It provides a comparison without the experimental treatment. Differences can then be attributed more confidently to the treatment.
Karta 425
Pytanie
In an experiment, what is the dependent variable?
Odpowiedź
The measured response. It may change because of the independent variable.
Karta 426
Pytanie
What form can a useful experimental prediction take?
Odpowiedź
If the independent variable changes in a stated way, then the dependent variable should respond in a stated way. The reason links it to the hypothesis.
Karta 427
Pytanie
What does a positive control demonstrate?
Odpowiedź
That the setup can produce a known response. If it fails, the test system may be defective.
Karta 428
Pytanie
Why randomly assign subjects to experimental groups?
Odpowiedź
To distribute known and unknown differences more evenly. This reduces selection bias and confounding.
Karta 429
Pytanie
How can blinding reduce bias?
Odpowiedź
It keeps participants, observers, or both unaware of treatment assignments. Expectations are less likely to affect behavior or measurement.
Karta 430
Pytanie
What is a placebo?
Odpowiedź
An inactive treatment designed to resemble the experimental treatment. It helps separate treatment effects from expectation effects.
Karta 431
Pytanie
What does a negative control demonstrate?
Odpowiedź
What happens when the tested cause is absent. An unexpected response may reveal contamination or another source.
Karta 432
Pytanie
Why does a larger sample often improve a study?
Odpowiedź
It reduces the influence of chance variation and supports more stable estimates. It cannot repair a biased sampling method.
Karta 433
Pytanie
Why repeat trials within an experiment?
Odpowiedź
To estimate variability and check consistency. One unusual trial then has less influence.
Karta 434
Pytanie
Why must an experimental procedure be detailed and standardized?
Odpowiedź
So groups are treated consistently and others can reproduce the work. Uncontrolled procedural differences create alternative explanations.
Karta 435
Pytanie
Why calibrate a measuring instrument before collecting data?
Odpowiedź
To compare its readings with a known standard and reduce systematic error. Calibration improves confidence in accuracy.
Karta 436
Pytanie
What is an operational definition?
Odpowiedź
A precise statement of how a variable is measured or manipulated. It turns an abstract concept into a repeatable procedure.
Karta 437
Pytanie
How does independent replication differ from repeated trials?
Odpowiedź
Independent replication repeats a study with independently collected data, often by a different investigator; repeated trials rerun measurements within the original experiment. Replication tests consistency across separate studies.
Karta 438
Pytanie
Why should raw data be recorded before interpretation?
Odpowiedź
It preserves the observations separately from conclusions. Others can check calculations and reasoning.
Karta 439
Pytanie
What should a scientific conclusion do?
Odpowiedź
Answer the research question using the data and acknowledge limits. It should not claim more than the design supports.
Karta 440
Pytanie
What should happen when data do not support a hypothesis?
Odpowiedź
Revise or reject the hypothesis and consider new tests. Data should not be altered to preserve the original idea.
Karta 441
Pytanie
What is a study limitation?
Odpowiedź
A feature that restricts interpretation or generalization. Small samples, short duration, and imperfect measurements are examples.
Karta 442
Pytanie
Why are ethics part of experimental design?
Odpowiedź
Research must protect participants, organisms, and communities while balancing risks and benefits. Consent and humane treatment are key examples.
Karta 443
Pytanie
How does an observational study differ from an experiment?
Odpowiedź
It measures variables without assigning the exposure. It can find associations but usually supports weaker causal conclusions.
Karta 444
Pytanie
Plants receive 0, 2, or 4 hours of added light, and growth is measured. What is the independent variable?
Odpowiedź
Hours of added light. Plant growth is the dependent variable.
Karta 445
Pytanie
A fertilizer study gives every plant the same water, soil, and temperature. What are these conditions?
Odpowiedź
Controlled variables. Keeping them constant isolates the fertilizer's effect.
Karta 446
Pytanie
A drug group improves more than a control group, but the groups were not randomly assigned. What is the main caution?
Odpowiedź
Preexisting group differences could explain some improvement. The result is suggestive, but the design weakens a causal claim.

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446 kart