# 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\.

Por el autor [Flashcards Open Source App](<https://nibomo.com/es/catalog/authors/flashcards-open-source-app/>)

[Estudia este mazo gratis](<https://app.nibomo.com/catalog/import/f8883ee1-e4a3-585f-92c6-5013dc3e8dbc>)

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## Detalles del mazo

- Tarjetas: 120 tarjetas
- Versión: 2
- Publicado: 23 de agosto de 2026
- Última actualización: 10 de septiembre de 2026
- Licencia: Common knowledge · CC0 1\.0
- Idiomas del público: [en](<https://nibomo.com/es/catalog/languages/en/>)
- Materia: Biochemistry
- Etiquetas: amino\-acids

## Sobre este mazo

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.

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## Tarjetas de este mazo

### Tarjeta 1

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 2

**Pregunta**

Valine → three-letter code

**Respuesta**

Val

### Tarjeta 3

**Pregunta**

Serine → one-letter code

**Respuesta**

S

### Tarjeta 4

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 5

**Pregunta**

Phenylalanine → three-letter code

**Respuesta**

Phe

### Tarjeta 6

**Pregunta**

Lysine → one-letter code

**Respuesta**

K

### Tarjeta 7

**Pregunta**

![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?

**Respuesta**

Alanine — side chain: `Cα–CH₃`.

### Tarjeta 8

**Pregunta**

Isoleucine → three-letter code

**Respuesta**

Ile

### Tarjeta 9

**Pregunta**

Cysteine → one-letter code

**Respuesta**

C

### Tarjeta 10

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 11

**Pregunta**

Tyrosine → three-letter code

**Respuesta**

Tyr

### Tarjeta 12

**Pregunta**

Arginine → one-letter code

**Respuesta**

R

### Tarjeta 13

**Pregunta**

![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?

**Respuesta**

Proline — side chain: `Cα–(CH₂)₃–Nα`.

### Tarjeta 14

**Pregunta**

Leucine → three-letter code

**Respuesta**

Leu

### Tarjeta 15

**Pregunta**

Threonine → one-letter code

**Respuesta**

T

### Tarjeta 16

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 17

**Pregunta**

Tryptophan → three-letter code

**Respuesta**

Trp

### Tarjeta 18

**Pregunta**

Methionine → one-letter code

**Respuesta**

M

### Tarjeta 19

**Pregunta**

![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?

**Respuesta**

Glycine — side chain: `Cα–H`.

### Tarjeta 20

**Pregunta**

Glutamate → three-letter code

**Respuesta**

Glu

### Tarjeta 21

**Pregunta**

Val → amino-acid name

**Respuesta**

Valine

### Tarjeta 22

**Pregunta**

S → amino-acid name

**Respuesta**

Serine

### Tarjeta 23

**Pregunta**

Asparagine → three-letter code

**Respuesta**

Asn

### Tarjeta 24

**Pregunta**

Phenylalanine → one-letter code

**Respuesta**

F

### Tarjeta 25

**Pregunta**

![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?

**Respuesta**

Lysine — side chain: `Cα–(CH₂)₄–NH₂`.

### Tarjeta 26

**Pregunta**

Alanine → draw or recall the side chain

**Respuesta**

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

Side chain: `Cα–CH₃`.

### Tarjeta 27

**Pregunta**

Ile → amino-acid name

**Respuesta**

Isoleucine

### Tarjeta 28

**Pregunta**

C → amino-acid name

**Respuesta**

Cysteine

### Tarjeta 29

**Pregunta**

Aspartate → three-letter code

**Respuesta**

Asp

### Tarjeta 30

**Pregunta**

Tyrosine → one-letter code

**Respuesta**

Y

### Tarjeta 31

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 32

**Pregunta**

Proline → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 33

**Pregunta**

Leu → amino-acid name

**Respuesta**

Leucine

### Tarjeta 34

**Pregunta**

T → amino-acid name

**Respuesta**

Threonine

### Tarjeta 35

**Pregunta**

Glutamine → three-letter code

**Respuesta**

Gln

### Tarjeta 36

**Pregunta**

Tryptophan → one-letter code

**Respuesta**

W

### Tarjeta 37

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 38

**Pregunta**

Glycine → draw or recall the side chain

**Respuesta**

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

Side chain: `Cα–H`.

### Tarjeta 39

**Pregunta**

Glu → amino-acid name

**Respuesta**

Glutamate

### Tarjeta 40

**Pregunta**

Histidine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 41

**Pregunta**

K → amino-acid name

**Respuesta**

Lysine

### Tarjeta 42

**Pregunta**

Alanine → three-letter code

**Respuesta**

Ala

### Tarjeta 43

**Pregunta**

Isoleucine → one-letter code

**Respuesta**

I

### Tarjeta 44

**Pregunta**

![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?

**Respuesta**

Cysteine — side chain: `Cα–CH₂–SH`.

### Tarjeta 45

**Pregunta**

Aspartate → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 46

**Pregunta**

Tyr → amino-acid name

**Respuesta**

Tyrosine

### Tarjeta 47

**Pregunta**

R → amino-acid name

**Respuesta**

Arginine

### Tarjeta 48

**Pregunta**

Proline → three-letter code

**Respuesta**

Pro

### Tarjeta 49

**Pregunta**

Leucine → one-letter code

**Respuesta**

L

### Tarjeta 50

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 51

**Pregunta**

Glutamine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 52

**Pregunta**

Trp → amino-acid name

**Respuesta**

Tryptophan

### Tarjeta 53

**Pregunta**

M → amino-acid name

**Respuesta**

Methionine

### Tarjeta 54

**Pregunta**

Glycine → three-letter code

**Respuesta**

Gly

### Tarjeta 55

**Pregunta**

Glutamate → one-letter code

**Respuesta**

E

### Tarjeta 56

**Pregunta**

Histidine → three-letter code

**Respuesta**

His

### Tarjeta 57

**Pregunta**

Valine → one-letter code

**Respuesta**

V

### Tarjeta 58

**Pregunta**

![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?

**Respuesta**

Serine — side chain: `Cα–CH₂–OH`.

### Tarjeta 59

**Pregunta**

Asparagine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 60

**Pregunta**

Phe → amino-acid name

**Respuesta**

Phenylalanine

### Tarjeta 61

**Pregunta**

I → amino-acid name

**Respuesta**

Isoleucine

### Tarjeta 62

**Pregunta**

Cysteine → draw or recall the side chain

**Respuesta**

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

Side chain: `Cα–CH₂–SH`.

### Tarjeta 63

**Pregunta**

Aspartate → one-letter code

**Respuesta**

D

### Tarjeta 64

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 65

**Pregunta**

Arginine → three-letter code

**Respuesta**

Arg

### Tarjeta 66

**Pregunta**

Pro → amino-acid name

**Respuesta**

Proline

### Tarjeta 67

**Pregunta**

L → amino-acid name

**Respuesta**

Leucine

### Tarjeta 68

**Pregunta**

Threonine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 69

**Pregunta**

Glutamine → one-letter code

**Respuesta**

Q

### Tarjeta 70

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 71

**Pregunta**

Methionine → three-letter code

**Respuesta**

Met

### Tarjeta 72

**Pregunta**

Gly → amino-acid name

**Respuesta**

Glycine

### Tarjeta 73

**Pregunta**

E → amino-acid name

**Respuesta**

Glutamate

### Tarjeta 74

**Pregunta**

His → amino-acid name

**Respuesta**

Histidine

### Tarjeta 75

**Pregunta**

V → amino-acid name

**Respuesta**

Valine

### Tarjeta 76

**Pregunta**

Serine → draw or recall the side chain

**Respuesta**

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

Side chain: `Cα–CH₂–OH`.

### Tarjeta 77

**Pregunta**

Asparagine → one-letter code

**Respuesta**

N

### Tarjeta 78

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 79

**Pregunta**

Lysine → three-letter code

**Respuesta**

Lys

### Tarjeta 80

**Pregunta**

Ala → amino-acid name

**Respuesta**

Alanine

### Tarjeta 81

**Pregunta**

Proline → one-letter code

**Respuesta**

P

### Tarjeta 82

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 83

**Pregunta**

Threonine → three-letter code

**Respuesta**

Thr

### Tarjeta 84

**Pregunta**

Gln → amino-acid name

**Respuesta**

Glutamine

### Tarjeta 85

**Pregunta**

W → amino-acid name

**Respuesta**

Tryptophan

### Tarjeta 86

**Pregunta**

Methionine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 87

**Pregunta**

Glycine → one-letter code

**Respuesta**

G

### Tarjeta 88

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 89

**Pregunta**

Histidine → one-letter code

**Respuesta**

H

### Tarjeta 90

**Pregunta**

![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?

**Respuesta**

Valine — side chain: `Cα–CH(CH₃)₂`.

### Tarjeta 91

**Pregunta**

Serine → three-letter code

**Respuesta**

Ser

### Tarjeta 92

**Pregunta**

Asn → amino-acid name

**Respuesta**

Asparagine

### Tarjeta 93

**Pregunta**

F → amino-acid name

**Respuesta**

Phenylalanine

### Tarjeta 94

**Pregunta**

Lysine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 95

**Pregunta**

Alanine → one-letter code

**Respuesta**

A

### Tarjeta 96

**Pregunta**

![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?

**Respuesta**

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

### Tarjeta 97

**Pregunta**

Cysteine → three-letter code

**Respuesta**

Cys

### Tarjeta 98

**Pregunta**

Asp → amino-acid name

**Respuesta**

Aspartate

### Tarjeta 99

**Pregunta**

Y → amino-acid name

**Respuesta**

Tyrosine

### Tarjeta 100

**Pregunta**

Arginine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 101

**Pregunta**

Ser → amino-acid name

**Respuesta**

Serine

### Tarjeta 102

**Pregunta**

N → amino-acid name

**Respuesta**

Asparagine

### Tarjeta 103

**Pregunta**

Phenylalanine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 104

**Pregunta**

Lys → amino-acid name

**Respuesta**

Lysine

### Tarjeta 105

**Pregunta**

A → amino-acid name

**Respuesta**

Alanine

### Tarjeta 106

**Pregunta**

Isoleucine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 107

**Pregunta**

Cys → amino-acid name

**Respuesta**

Cysteine

### Tarjeta 108

**Pregunta**

D → amino-acid name

**Respuesta**

Aspartate

### Tarjeta 109

**Pregunta**

Tyrosine → draw or recall the side chain

**Respuesta**

![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)`.

### Tarjeta 110

**Pregunta**

Arg → amino-acid name

**Respuesta**

Arginine

### Tarjeta 111

**Pregunta**

P → amino-acid name

**Respuesta**

Proline

### Tarjeta 112

**Pregunta**

Leucine → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 113

**Pregunta**

Thr → amino-acid name

**Respuesta**

Threonine

### Tarjeta 114

**Pregunta**

Q → amino-acid name

**Respuesta**

Glutamine

### Tarjeta 115

**Pregunta**

Tryptophan → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 116

**Pregunta**

Met → amino-acid name

**Respuesta**

Methionine

### Tarjeta 117

**Pregunta**

G → amino-acid name

**Respuesta**

Glycine

### Tarjeta 118

**Pregunta**

Glutamate → draw or recall the side chain

**Respuesta**

![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`.

### Tarjeta 119

**Pregunta**

H → amino-acid name

**Respuesta**

Histidine

### Tarjeta 120

**Pregunta**

Valine → draw or recall the side chain

**Respuesta**

![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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