# Amino Acid Flashcards: 20 Side\-Chain Structures & Codes

![Abstract molecular study scene with colorful ball\-and\-stick side\-chain forms arranged around an open center\.](<https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/a03b60fd2b9e8f984ae9a8f50ce304d34c33bb233c91e34e1350021551ea90eb>)

Learn the 20 standard amino acids with 120 flashcards for side\-chain recognition and drawing, plus one\- and three\-letter code recall in both directions\.

من إعداد [Flashcards Open Source App](<https://nibomo.com/ar/catalog/authors/flashcards-open-source-app/>)

[ادرس هذه الرزمة مجانًا](<https://app.nibomo.com/catalog/import/f8883ee1-e4a3-585f-92c6-5013dc3e8dbc>)

سيفتح تطبيق Nibomo لتبدأ الدراسة\.

## تفاصيل الرزمة

- البطاقات: ١٢٠ بطاقة
- الإصدار: ٢
- تاريخ النشر: ٢٣ أغسطس ٢٠٢٦
- آخر تحديث: ١٠ سبتمبر ٢٠٢٦
- الترخيص: Common knowledge · CC0 1\.0
- لغات الجمهور: [en](<https://nibomo.com/ar/catalog/languages/en/>)
- المادة: Biochemistry
- الوسوم: amino\-acids

## حول هذه الرزمة

These amino acid flashcards train the 20 standard amino acids as six separate recall tasks. You’ll practice side-chain structure → amino-acid name, amino-acid name → side-chain drawing, amino-acid name → three-letter code, three-letter code → amino-acid name, amino-acid name → one-letter code, and one-letter code → amino-acid name. Each target has its own card, so remembering a code never hides a missed structure.

The structure cards show only the variable side chain. A small Cα attachment marker fixes the convention without turning the shared amino-acid backbone into another recognition task; proline also shows the side chain’s connection to the backbone nitrogen. The diagrams use one neutral connectivity convention. They do not test pH-dependent charge states or stereochemistry.

The fixed sequence introduces each structure before its drawing prompt and each code before its reverse lookup for the same amino acid. It interleaves all six directions, keeps every same-amino-acid variant at least three unrelated cards apart, and separates visually or code-confusable concepts. The review scheduler handles longer-term spacing after installation.

The deck deliberately leaves out side-chain class labels because classification schemes vary. It also excludes pKa values, charge-state tables, isoelectric points, codons, nutrition categories, full-backbone recognition, nonstandard amino acids and ambiguous sequence symbols, peptide-bond and protein-folding trivia, and exam, clinical, disease, supplement, dietary, or pronunciation material. Those mappings either vary by convention or belong outside this focused side-chain-and-code recall set.

[IUPAC-IUB nomenclature recommendations](https://publications.iupac.org/pac/1984/pdf/5605x0595.pdf), [NCBI’s overview of amino acids and their side chains](https://www.ncbi.nlm.nih.gov/books/NBK9879/), and the [NCBI amino-acid code table](https://www.ncbi.nlm.nih.gov/books/NBK44863/table/sequencesquickstart.Te/) were used only to verify common-knowledge facts. All prompts, answers, selection, order, molecular diagrams, metadata, and cover composition were created independently. No source or competitor prose, images, screenshots, trade dress, or logos were copied. Facts are not claimed as proprietary. The original wording, organization, metadata, diagrams, and cover are dedicated under CC0 1.0 to the extent applicable rights exist.

## رزم مشابهة

- [Amino Acid Side\-Chain Properties Flashcards: Polarity &amp; Charge](<https://nibomo.com/ar/catalog/packages/amino-acid-side-chain-properties-flashcards/>)
- [Functional Group Flashcards: Names &amp; Structures](<https://nibomo.com/ar/catalog/packages/organic-chemistry-functional-groups-flashcards/>)
- [U\.S\. State Abbreviations Flashcards: All 50 Postal Codes](<https://nibomo.com/ar/catalog/packages/us-state-abbreviations-flashcards/>)
- [Cell Organelle Flashcards: 24 Structures &amp; Functions in Both Directions](<https://nibomo.com/ar/catalog/packages/cell-organelles-functions/>)
- [Blind 75 Data Structures &amp; Algorithms Problems with Python Solutions](<https://nibomo.com/ar/catalog/packages/blind-75-python-solutions/>)
- [कक्षा 10 अम्ल, क्षारक और लवण: हिंदी फ्लैशकार्ड](<https://nibomo.com/ar/catalog/packages/ncert-class-10-acids-bases-salts-flashcards-hindi/>)

## بطاقات هذه الرزمة

### البطاقة ١

**السؤال**

![Side-chain diagram showing CH₂ joined to a five-membered ring containing NH and N from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/eefabd06571c635134e5a4bdf8720a03f4d71afd26513ac4ceca454739b8c981)

Which amino acid has this side chain?

**الإجابة**

Histidine — side chain: `Cα–CH₂–imidazolyl`.

### البطاقة ٢

**السؤال**

Valine → three-letter code

**الإجابة**

Val

### البطاقة ٣

**السؤال**

Serine → one-letter code

**الإجابة**

S

### البطاقة ٤

**السؤال**

![Side-chain diagram showing CH₂–C(=O)–NH₂ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/7e4ff407b91cf6f7820d813d72ac9da34b3669e2e6b58beb3a977d1b3506eb7b)

Which amino acid has this side chain?

**الإجابة**

Asparagine — side chain: `Cα–CH₂–C(=O)–NH₂`.

### البطاقة ٥

**السؤال**

Phenylalanine → three-letter code

**الإجابة**

Phe

### البطاقة ٦

**السؤال**

Lysine → one-letter code

**الإجابة**

K

### البطاقة ٧

**السؤال**

![Side-chain diagram showing one CH₃ group bonded to the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/29c4ab3ee392c9a6fc1c43f8983657e76ff3331be10caac184741edd951d8bc3)

Which amino acid has this side chain?

**الإجابة**

Alanine — side chain: `Cα–CH₃`.

### البطاقة ٨

**السؤال**

Isoleucine → three-letter code

**الإجابة**

Ile

### البطاقة ٩

**السؤال**

Cysteine → one-letter code

**الإجابة**

C

### البطاقة ١٠

**السؤال**

![Side-chain diagram showing CH₂–C(=O)–OH from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/be88622a40264d26e2d8dc797f44d0e1a4f12224271be505a2499d31a749f9ad)

Which amino acid has this side chain?

**الإجابة**

Aspartate — side chain: `Cα–CH₂–C(=O)–OH`.

### البطاقة ١١

**السؤال**

Tyrosine → three-letter code

**الإجابة**

Tyr

### البطاقة ١٢

**السؤال**

Arginine → one-letter code

**الإجابة**

R

### البطاقة ١٣

**السؤال**

![Side-chain diagram showing three CH₂ groups linking the Cα and Nα attachment markers.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/a3f29fdf48b892b242e70240ad16743680384fd24758e505ed40aec6f4ba98ee)

Which amino acid has this side chain?

**الإجابة**

Proline — side chain: `Cα–(CH₂)₃–Nα`.

### البطاقة ١٤

**السؤال**

Leucine → three-letter code

**الإجابة**

Leu

### البطاقة ١٥

**السؤال**

Threonine → one-letter code

**الإجابة**

T

### البطاقة ١٦

**السؤال**

![Side-chain diagram showing CH₂–CH₂–C(=O)–NH₂ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/385280d384f44bbc79e29b3a6ea360e679bc5f1f9f259d9d46834f457b8b5e29)

Which amino acid has this side chain?

**الإجابة**

Glutamine — side chain: `Cα–CH₂–CH₂–C(=O)–NH₂`.

### البطاقة ١٧

**السؤال**

Tryptophan → three-letter code

**الإجابة**

Trp

### البطاقة ١٨

**السؤال**

Methionine → one-letter code

**الإجابة**

M

### البطاقة ١٩

**السؤال**

![Side-chain diagram showing a hydrogen bonded to the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/4892cd3bc24b272bb6c6abaa07f195c1c38db167a939bb747d2e9cc8fc23dfb7)

Which amino acid has this side chain?

**الإجابة**

Glycine — side chain: `Cα–H`.

### البطاقة ٢٠

**السؤال**

Glutamate → three-letter code

**الإجابة**

Glu

### البطاقة ٢١

**السؤال**

Val → amino-acid name

**الإجابة**

Valine

### البطاقة ٢٢

**السؤال**

S → amino-acid name

**الإجابة**

Serine

### البطاقة ٢٣

**السؤال**

Asparagine → three-letter code

**الإجابة**

Asn

### البطاقة ٢٤

**السؤال**

Phenylalanine → one-letter code

**الإجابة**

F

### البطاقة ٢٥

**السؤال**

![Side-chain diagram showing (CH₂)₄–NH₂ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/530eba43621eb2e1e2fca9eff878886dd05b4f894378fadfa5e7825133aa5f97)

Which amino acid has this side chain?

**الإجابة**

Lysine — side chain: `Cα–(CH₂)₄–NH₂`.

### البطاقة ٢٦

**السؤال**

Alanine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing one CH₃ group bonded to the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/29c4ab3ee392c9a6fc1c43f8983657e76ff3331be10caac184741edd951d8bc3)

Side chain: `Cα–CH₃`.

### البطاقة ٢٧

**السؤال**

Ile → amino-acid name

**الإجابة**

Isoleucine

### البطاقة ٢٨

**السؤال**

C → amino-acid name

**الإجابة**

Cysteine

### البطاقة ٢٩

**السؤال**

Aspartate → three-letter code

**الإجابة**

Asp

### البطاقة ٣٠

**السؤال**

Tyrosine → one-letter code

**الإجابة**

Y

### البطاقة ٣١

**السؤال**

![Side-chain diagram showing (CH₂)₃–NH–C(=NH)–NH₂ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/1a53b6a1a88e0030eab25a86b8914a34567d4b68184099d8c80f09b03a089b58)

Which amino acid has this side chain?

**الإجابة**

Arginine — side chain: `Cα–(CH₂)₃–NH–C(=NH)–NH₂`.

### البطاقة ٣٢

**السؤال**

Proline → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing three CH₂ groups linking the Cα and Nα attachment markers.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/a3f29fdf48b892b242e70240ad16743680384fd24758e505ed40aec6f4ba98ee)

Side chain: `Cα–(CH₂)₃–Nα`.

### البطاقة ٣٣

**السؤال**

Leu → amino-acid name

**الإجابة**

Leucine

### البطاقة ٣٤

**السؤال**

T → amino-acid name

**الإجابة**

Threonine

### البطاقة ٣٥

**السؤال**

Glutamine → three-letter code

**الإجابة**

Gln

### البطاقة ٣٦

**السؤال**

Tryptophan → one-letter code

**الإجابة**

W

### البطاقة ٣٧

**السؤال**

![Side-chain diagram showing CH₂–CH₂–S–CH₃ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/c5ff2c00a9e3f1992771c19ae5356a41559d1473e18aa1362558e8c8f018c2b5)

Which amino acid has this side chain?

**الإجابة**

Methionine — side chain: `Cα–CH₂–CH₂–S–CH₃`.

### البطاقة ٣٨

**السؤال**

Glycine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing a hydrogen bonded to the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/4892cd3bc24b272bb6c6abaa07f195c1c38db167a939bb747d2e9cc8fc23dfb7)

Side chain: `Cα–H`.

### البطاقة ٣٩

**السؤال**

Glu → amino-acid name

**الإجابة**

Glutamate

### البطاقة ٤٠

**السؤال**

Histidine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂ joined to a five-membered ring containing NH and N from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/eefabd06571c635134e5a4bdf8720a03f4d71afd26513ac4ceca454739b8c981)

Side chain: `Cα–CH₂–imidazolyl`.

### البطاقة ٤١

**السؤال**

K → amino-acid name

**الإجابة**

Lysine

### البطاقة ٤٢

**السؤال**

Alanine → three-letter code

**الإجابة**

Ala

### البطاقة ٤٣

**السؤال**

Isoleucine → one-letter code

**الإجابة**

I

### البطاقة ٤٤

**السؤال**

![Side-chain diagram showing CH₂–SH from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/4b49de29d947aea65a0314c45479865b341a7c0c55ba0bd71302bc8668f3034b)

Which amino acid has this side chain?

**الإجابة**

Cysteine — side chain: `Cα–CH₂–SH`.

### البطاقة ٤٥

**السؤال**

Aspartate → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂–C(=O)–OH from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/be88622a40264d26e2d8dc797f44d0e1a4f12224271be505a2499d31a749f9ad)

Side chain: `Cα–CH₂–C(=O)–OH`.

### البطاقة ٤٦

**السؤال**

Tyr → amino-acid name

**الإجابة**

Tyrosine

### البطاقة ٤٧

**السؤال**

R → amino-acid name

**الإجابة**

Arginine

### البطاقة ٤٨

**السؤال**

Proline → three-letter code

**الإجابة**

Pro

### البطاقة ٤٩

**السؤال**

Leucine → one-letter code

**الإجابة**

L

### البطاقة ٥٠

**السؤال**

![Side-chain diagram showing CH bonded to OH and CH₃ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/782e0535e46394f54efda2f2c9d23c0b157949c5606f29f689da55050825b8f5)

Which amino acid has this side chain?

**الإجابة**

Threonine — side chain: `Cα–CH(OH)–CH₃`.

### البطاقة ٥١

**السؤال**

Glutamine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂–CH₂–C(=O)–NH₂ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/385280d384f44bbc79e29b3a6ea360e679bc5f1f9f259d9d46834f457b8b5e29)

Side chain: `Cα–CH₂–CH₂–C(=O)–NH₂`.

### البطاقة ٥٢

**السؤال**

Trp → amino-acid name

**الإجابة**

Tryptophan

### البطاقة ٥٣

**السؤال**

M → amino-acid name

**الإجابة**

Methionine

### البطاقة ٥٤

**السؤال**

Glycine → three-letter code

**الإجابة**

Gly

### البطاقة ٥٥

**السؤال**

Glutamate → one-letter code

**الإجابة**

E

### البطاقة ٥٦

**السؤال**

Histidine → three-letter code

**الإجابة**

His

### البطاقة ٥٧

**السؤال**

Valine → one-letter code

**الإجابة**

V

### البطاقة ٥٨

**السؤال**

![Side-chain diagram showing CH₂–OH from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/144e6bec9c9cad8583515a9c036caf4b2e983c00c704b3c67c10f303a87237eb)

Which amino acid has this side chain?

**الإجابة**

Serine — side chain: `Cα–CH₂–OH`.

### البطاقة ٥٩

**السؤال**

Asparagine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂–C(=O)–NH₂ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/7e4ff407b91cf6f7820d813d72ac9da34b3669e2e6b58beb3a977d1b3506eb7b)

Side chain: `Cα–CH₂–C(=O)–NH₂`.

### البطاقة ٦٠

**السؤال**

Phe → amino-acid name

**الإجابة**

Phenylalanine

### البطاقة ٦١

**السؤال**

I → amino-acid name

**الإجابة**

Isoleucine

### البطاقة ٦٢

**السؤال**

Cysteine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂–SH from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/4b49de29d947aea65a0314c45479865b341a7c0c55ba0bd71302bc8668f3034b)

Side chain: `Cα–CH₂–SH`.

### البطاقة ٦٣

**السؤال**

Aspartate → one-letter code

**الإجابة**

D

### البطاقة ٦٤

**السؤال**

![Side-chain diagram showing CH₂ joined to a six-membered ring with an opposite OH group from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/8200cf8a37c2f9ce228a57faff599f4cb303fdb08ab0b33a0a2f2ccff602219a)

Which amino acid has this side chain?

**الإجابة**

Tyrosine — side chain: `Cα–CH₂–C₆H₄–OH (para)`.

### البطاقة ٦٥

**السؤال**

Arginine → three-letter code

**الإجابة**

Arg

### البطاقة ٦٦

**السؤال**

Pro → amino-acid name

**الإجابة**

Proline

### البطاقة ٦٧

**السؤال**

L → amino-acid name

**الإجابة**

Leucine

### البطاقة ٦٨

**السؤال**

Threonine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH bonded to OH and CH₃ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/782e0535e46394f54efda2f2c9d23c0b157949c5606f29f689da55050825b8f5)

Side chain: `Cα–CH(OH)–CH₃`.

### البطاقة ٦٩

**السؤال**

Glutamine → one-letter code

**الإجابة**

Q

### البطاقة ٧٠

**السؤال**

![Side-chain diagram showing the Cα attachment marker joined through CH₂ to position 3 of fused five- and six-membered rings containing NH.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/4d669a96569d46dd38fa54d4a7e6b17b47aa8e2684351622b1f0f6294be99026)

Which amino acid has this side chain?

**الإجابة**

Tryptophan — side chain: `Cα–CH₂–indol-3-yl`.

### البطاقة ٧١

**السؤال**

Methionine → three-letter code

**الإجابة**

Met

### البطاقة ٧٢

**السؤال**

Gly → amino-acid name

**الإجابة**

Glycine

### البطاقة ٧٣

**السؤال**

E → amino-acid name

**الإجابة**

Glutamate

### البطاقة ٧٤

**السؤال**

His → amino-acid name

**الإجابة**

Histidine

### البطاقة ٧٥

**السؤال**

V → amino-acid name

**الإجابة**

Valine

### البطاقة ٧٦

**السؤال**

Serine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂–OH from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/144e6bec9c9cad8583515a9c036caf4b2e983c00c704b3c67c10f303a87237eb)

Side chain: `Cα–CH₂–OH`.

### البطاقة ٧٧

**السؤال**

Asparagine → one-letter code

**الإجابة**

N

### البطاقة ٧٨

**السؤال**

![Side-chain diagram showing CH₂ joined to a six-membered ring with alternating double bonds from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/fb7661413ef90aae3b37d64324775aaa530fcc9b970f60eb09b2b2df6c07bd6e)

Which amino acid has this side chain?

**الإجابة**

Phenylalanine — side chain: `Cα–CH₂–C₆H₅`.

### البطاقة ٧٩

**السؤال**

Lysine → three-letter code

**الإجابة**

Lys

### البطاقة ٨٠

**السؤال**

Ala → amino-acid name

**الإجابة**

Alanine

### البطاقة ٨١

**السؤال**

Proline → one-letter code

**الإجابة**

P

### البطاقة ٨٢

**السؤال**

![Side-chain diagram showing CH₂–CH with two terminal CH₃ branches from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/6cd3680e4bf0d5f0756853d6d44e27787efa78323e20bf3160810420e628e65a)

Which amino acid has this side chain?

**الإجابة**

Leucine — side chain: `Cα–CH₂–CH(CH₃)₂`.

### البطاقة ٨٣

**السؤال**

Threonine → three-letter code

**الإجابة**

Thr

### البطاقة ٨٤

**السؤال**

Gln → amino-acid name

**الإجابة**

Glutamine

### البطاقة ٨٥

**السؤال**

W → amino-acid name

**الإجابة**

Tryptophan

### البطاقة ٨٦

**السؤال**

Methionine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂–CH₂–S–CH₃ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/c5ff2c00a9e3f1992771c19ae5356a41559d1473e18aa1362558e8c8f018c2b5)

Side chain: `Cα–CH₂–CH₂–S–CH₃`.

### البطاقة ٨٧

**السؤال**

Glycine → one-letter code

**الإجابة**

G

### البطاقة ٨٨

**السؤال**

![Side-chain diagram showing CH₂–CH₂–C(=O)–OH from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/af8a07174a336305006d33c313d4cfbd919f3313d49c2c8cbaa7869cc6dcbeb4)

Which amino acid has this side chain?

**الإجابة**

Glutamate — side chain: `Cα–CH₂–CH₂–C(=O)–OH`.

### البطاقة ٨٩

**السؤال**

Histidine → one-letter code

**الإجابة**

H

### البطاقة ٩٠

**السؤال**

![Side-chain diagram showing CH bonded to two CH₃ branches from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/e1cd6292708b8c43ebe62b2b505a3b7a5a75a2d451ff4a7a789108aeb114c7b0)

Which amino acid has this side chain?

**الإجابة**

Valine — side chain: `Cα–CH(CH₃)₂`.

### البطاقة ٩١

**السؤال**

Serine → three-letter code

**الإجابة**

Ser

### البطاقة ٩٢

**السؤال**

Asn → amino-acid name

**الإجابة**

Asparagine

### البطاقة ٩٣

**السؤال**

F → amino-acid name

**الإجابة**

Phenylalanine

### البطاقة ٩٤

**السؤال**

Lysine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing (CH₂)₄–NH₂ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/530eba43621eb2e1e2fca9eff878886dd05b4f894378fadfa5e7825133aa5f97)

Side chain: `Cα–(CH₂)₄–NH₂`.

### البطاقة ٩٥

**السؤال**

Alanine → one-letter code

**الإجابة**

A

### البطاقة ٩٦

**السؤال**

![Side-chain diagram showing CH with one CH₃ branch and one CH₂–CH₃ branch from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/7fab626b620475c432dc1218f0b812c51159a18ffbc3dbd7c5a7877ac3aa753f)

Which amino acid has this side chain?

**الإجابة**

Isoleucine — side chain: `Cα–CH(CH₃)–CH₂–CH₃`.

### البطاقة ٩٧

**السؤال**

Cysteine → three-letter code

**الإجابة**

Cys

### البطاقة ٩٨

**السؤال**

Asp → amino-acid name

**الإجابة**

Aspartate

### البطاقة ٩٩

**السؤال**

Y → amino-acid name

**الإجابة**

Tyrosine

### البطاقة ١٠٠

**السؤال**

Arginine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing (CH₂)₃–NH–C(=NH)–NH₂ from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/1a53b6a1a88e0030eab25a86b8914a34567d4b68184099d8c80f09b03a089b58)

Side chain: `Cα–(CH₂)₃–NH–C(=NH)–NH₂`.

### البطاقة ١٠١

**السؤال**

Ser → amino-acid name

**الإجابة**

Serine

### البطاقة ١٠٢

**السؤال**

N → amino-acid name

**الإجابة**

Asparagine

### البطاقة ١٠٣

**السؤال**

Phenylalanine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂ joined to a six-membered ring with alternating double bonds from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/fb7661413ef90aae3b37d64324775aaa530fcc9b970f60eb09b2b2df6c07bd6e)

Side chain: `Cα–CH₂–C₆H₅`.

### البطاقة ١٠٤

**السؤال**

Lys → amino-acid name

**الإجابة**

Lysine

### البطاقة ١٠٥

**السؤال**

A → amino-acid name

**الإجابة**

Alanine

### البطاقة ١٠٦

**السؤال**

Isoleucine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH with one CH₃ branch and one CH₂–CH₃ branch from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/7fab626b620475c432dc1218f0b812c51159a18ffbc3dbd7c5a7877ac3aa753f)

Side chain: `Cα–CH(CH₃)–CH₂–CH₃`.

### البطاقة ١٠٧

**السؤال**

Cys → amino-acid name

**الإجابة**

Cysteine

### البطاقة ١٠٨

**السؤال**

D → amino-acid name

**الإجابة**

Aspartate

### البطاقة ١٠٩

**السؤال**

Tyrosine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂ joined to a six-membered ring with an opposite OH group from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/8200cf8a37c2f9ce228a57faff599f4cb303fdb08ab0b33a0a2f2ccff602219a)

Side chain: `Cα–CH₂–C₆H₄–OH (para)`.

### البطاقة ١١٠

**السؤال**

Arg → amino-acid name

**الإجابة**

Arginine

### البطاقة ١١١

**السؤال**

P → amino-acid name

**الإجابة**

Proline

### البطاقة ١١٢

**السؤال**

Leucine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂–CH with two terminal CH₃ branches from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/6cd3680e4bf0d5f0756853d6d44e27787efa78323e20bf3160810420e628e65a)

Side chain: `Cα–CH₂–CH(CH₃)₂`.

### البطاقة ١١٣

**السؤال**

Thr → amino-acid name

**الإجابة**

Threonine

### البطاقة ١١٤

**السؤال**

Q → amino-acid name

**الإجابة**

Glutamine

### البطاقة ١١٥

**السؤال**

Tryptophan → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing the Cα attachment marker joined through CH₂ to position 3 of fused five- and six-membered rings containing NH.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/4d669a96569d46dd38fa54d4a7e6b17b47aa8e2684351622b1f0f6294be99026)

Side chain: `Cα–CH₂–indol-3-yl`.

### البطاقة ١١٦

**السؤال**

Met → amino-acid name

**الإجابة**

Methionine

### البطاقة ١١٧

**السؤال**

G → amino-acid name

**الإجابة**

Glycine

### البطاقة ١١٨

**السؤال**

Glutamate → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH₂–CH₂–C(=O)–OH from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/af8a07174a336305006d33c313d4cfbd919f3313d49c2c8cbaa7869cc6dcbeb4)

Side chain: `Cα–CH₂–CH₂–C(=O)–OH`.

### البطاقة ١١٩

**السؤال**

H → amino-acid name

**الإجابة**

Histidine

### البطاقة ١٢٠

**السؤال**

Valine → draw or recall the side chain

**الإجابة**

![Side-chain diagram showing CH bonded to two CH₃ branches from the Cα attachment marker.](https://d2bq3tvt7zf1kf.cloudfront.net/catalog/media/e1cd6292708b8c43ebe62b2b505a3b7a5a75a2d451ff4a7a789108aeb114c7b0)

Side chain: `Cα–CH(CH₃)₂`.

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