# 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\.

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

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## 卡组详情

- 卡片: 120张卡片
- 版本: 2
- 发布日期: 2026年8月23日
- 最后更新: 2026年9月10日
- 许可证: Common knowledge · CC0 1\.0
- 受众语言: [en](<https://nibomo.com/zh/catalog/languages/en/>)
- 科目: Biochemistry
- 标签: amino\-acids

## 关于这套卡组

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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## 这套卡组中的卡片

### 卡片 1

**问题**

![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?

**答案**

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

### 卡片 2

**问题**

Valine → three-letter code

**答案**

Val

### 卡片 3

**问题**

Serine → one-letter code

**答案**

S

### 卡片 4

**问题**

![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?

**答案**

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

### 卡片 5

**问题**

Phenylalanine → three-letter code

**答案**

Phe

### 卡片 6

**问题**

Lysine → one-letter code

**答案**

K

### 卡片 7

**问题**

![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?

**答案**

Alanine — side chain: `Cα–CH₃`.

### 卡片 8

**问题**

Isoleucine → three-letter code

**答案**

Ile

### 卡片 9

**问题**

Cysteine → one-letter code

**答案**

C

### 卡片 10

**问题**

![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?

**答案**

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

### 卡片 11

**问题**

Tyrosine → three-letter code

**答案**

Tyr

### 卡片 12

**问题**

Arginine → one-letter code

**答案**

R

### 卡片 13

**问题**

![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?

**答案**

Proline — side chain: `Cα–(CH₂)₃–Nα`.

### 卡片 14

**问题**

Leucine → three-letter code

**答案**

Leu

### 卡片 15

**问题**

Threonine → one-letter code

**答案**

T

### 卡片 16

**问题**

![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?

**答案**

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

### 卡片 17

**问题**

Tryptophan → three-letter code

**答案**

Trp

### 卡片 18

**问题**

Methionine → one-letter code

**答案**

M

### 卡片 19

**问题**

![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?

**答案**

Glycine — side chain: `Cα–H`.

### 卡片 20

**问题**

Glutamate → three-letter code

**答案**

Glu

### 卡片 21

**问题**

Val → amino-acid name

**答案**

Valine

### 卡片 22

**问题**

S → amino-acid name

**答案**

Serine

### 卡片 23

**问题**

Asparagine → three-letter code

**答案**

Asn

### 卡片 24

**问题**

Phenylalanine → one-letter code

**答案**

F

### 卡片 25

**问题**

![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?

**答案**

Lysine — side chain: `Cα–(CH₂)₄–NH₂`.

### 卡片 26

**问题**

Alanine → draw or recall the side chain

**答案**

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

Side chain: `Cα–CH₃`.

### 卡片 27

**问题**

Ile → amino-acid name

**答案**

Isoleucine

### 卡片 28

**问题**

C → amino-acid name

**答案**

Cysteine

### 卡片 29

**问题**

Aspartate → three-letter code

**答案**

Asp

### 卡片 30

**问题**

Tyrosine → one-letter code

**答案**

Y

### 卡片 31

**问题**

![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?

**答案**

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

### 卡片 32

**问题**

Proline → draw or recall the side chain

**答案**

![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`.

### 卡片 33

**问题**

Leu → amino-acid name

**答案**

Leucine

### 卡片 34

**问题**

T → amino-acid name

**答案**

Threonine

### 卡片 35

**问题**

Glutamine → three-letter code

**答案**

Gln

### 卡片 36

**问题**

Tryptophan → one-letter code

**答案**

W

### 卡片 37

**问题**

![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?

**答案**

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

### 卡片 38

**问题**

Glycine → draw or recall the side chain

**答案**

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

Side chain: `Cα–H`.

### 卡片 39

**问题**

Glu → amino-acid name

**答案**

Glutamate

### 卡片 40

**问题**

Histidine → draw or recall the side chain

**答案**

![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`.

### 卡片 41

**问题**

K → amino-acid name

**答案**

Lysine

### 卡片 42

**问题**

Alanine → three-letter code

**答案**

Ala

### 卡片 43

**问题**

Isoleucine → one-letter code

**答案**

I

### 卡片 44

**问题**

![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?

**答案**

Cysteine — side chain: `Cα–CH₂–SH`.

### 卡片 45

**问题**

Aspartate → draw or recall the side chain

**答案**

![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`.

### 卡片 46

**问题**

Tyr → amino-acid name

**答案**

Tyrosine

### 卡片 47

**问题**

R → amino-acid name

**答案**

Arginine

### 卡片 48

**问题**

Proline → three-letter code

**答案**

Pro

### 卡片 49

**问题**

Leucine → one-letter code

**答案**

L

### 卡片 50

**问题**

![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?

**答案**

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

### 卡片 51

**问题**

Glutamine → draw or recall the side chain

**答案**

![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`.

### 卡片 52

**问题**

Trp → amino-acid name

**答案**

Tryptophan

### 卡片 53

**问题**

M → amino-acid name

**答案**

Methionine

### 卡片 54

**问题**

Glycine → three-letter code

**答案**

Gly

### 卡片 55

**问题**

Glutamate → one-letter code

**答案**

E

### 卡片 56

**问题**

Histidine → three-letter code

**答案**

His

### 卡片 57

**问题**

Valine → one-letter code

**答案**

V

### 卡片 58

**问题**

![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?

**答案**

Serine — side chain: `Cα–CH₂–OH`.

### 卡片 59

**问题**

Asparagine → draw or recall the side chain

**答案**

![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`.

### 卡片 60

**问题**

Phe → amino-acid name

**答案**

Phenylalanine

### 卡片 61

**问题**

I → amino-acid name

**答案**

Isoleucine

### 卡片 62

**问题**

Cysteine → draw or recall the side chain

**答案**

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

Side chain: `Cα–CH₂–SH`.

### 卡片 63

**问题**

Aspartate → one-letter code

**答案**

D

### 卡片 64

**问题**

![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?

**答案**

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

### 卡片 65

**问题**

Arginine → three-letter code

**答案**

Arg

### 卡片 66

**问题**

Pro → amino-acid name

**答案**

Proline

### 卡片 67

**问题**

L → amino-acid name

**答案**

Leucine

### 卡片 68

**问题**

Threonine → draw or recall the side chain

**答案**

![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`.

### 卡片 69

**问题**

Glutamine → one-letter code

**答案**

Q

### 卡片 70

**问题**

![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?

**答案**

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

### 卡片 71

**问题**

Methionine → three-letter code

**答案**

Met

### 卡片 72

**问题**

Gly → amino-acid name

**答案**

Glycine

### 卡片 73

**问题**

E → amino-acid name

**答案**

Glutamate

### 卡片 74

**问题**

His → amino-acid name

**答案**

Histidine

### 卡片 75

**问题**

V → amino-acid name

**答案**

Valine

### 卡片 76

**问题**

Serine → draw or recall the side chain

**答案**

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

Side chain: `Cα–CH₂–OH`.

### 卡片 77

**问题**

Asparagine → one-letter code

**答案**

N

### 卡片 78

**问题**

![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?

**答案**

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

### 卡片 79

**问题**

Lysine → three-letter code

**答案**

Lys

### 卡片 80

**问题**

Ala → amino-acid name

**答案**

Alanine

### 卡片 81

**问题**

Proline → one-letter code

**答案**

P

### 卡片 82

**问题**

![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?

**答案**

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

### 卡片 83

**问题**

Threonine → three-letter code

**答案**

Thr

### 卡片 84

**问题**

Gln → amino-acid name

**答案**

Glutamine

### 卡片 85

**问题**

W → amino-acid name

**答案**

Tryptophan

### 卡片 86

**问题**

Methionine → draw or recall the side chain

**答案**

![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`.

### 卡片 87

**问题**

Glycine → one-letter code

**答案**

G

### 卡片 88

**问题**

![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?

**答案**

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

### 卡片 89

**问题**

Histidine → one-letter code

**答案**

H

### 卡片 90

**问题**

![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?

**答案**

Valine — side chain: `Cα–CH(CH₃)₂`.

### 卡片 91

**问题**

Serine → three-letter code

**答案**

Ser

### 卡片 92

**问题**

Asn → amino-acid name

**答案**

Asparagine

### 卡片 93

**问题**

F → amino-acid name

**答案**

Phenylalanine

### 卡片 94

**问题**

Lysine → draw or recall the side chain

**答案**

![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`.

### 卡片 95

**问题**

Alanine → one-letter code

**答案**

A

### 卡片 96

**问题**

![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?

**答案**

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

### 卡片 97

**问题**

Cysteine → three-letter code

**答案**

Cys

### 卡片 98

**问题**

Asp → amino-acid name

**答案**

Aspartate

### 卡片 99

**问题**

Y → amino-acid name

**答案**

Tyrosine

### 卡片 100

**问题**

Arginine → draw or recall the side chain

**答案**

![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`.

### 卡片 101

**问题**

Ser → amino-acid name

**答案**

Serine

### 卡片 102

**问题**

N → amino-acid name

**答案**

Asparagine

### 卡片 103

**问题**

Phenylalanine → draw or recall the side chain

**答案**

![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`.

### 卡片 104

**问题**

Lys → amino-acid name

**答案**

Lysine

### 卡片 105

**问题**

A → amino-acid name

**答案**

Alanine

### 卡片 106

**问题**

Isoleucine → draw or recall the side chain

**答案**

![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`.

### 卡片 107

**问题**

Cys → amino-acid name

**答案**

Cysteine

### 卡片 108

**问题**

D → amino-acid name

**答案**

Aspartate

### 卡片 109

**问题**

Tyrosine → draw or recall the side chain

**答案**

![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)`.

### 卡片 110

**问题**

Arg → amino-acid name

**答案**

Arginine

### 卡片 111

**问题**

P → amino-acid name

**答案**

Proline

### 卡片 112

**问题**

Leucine → draw or recall the side chain

**答案**

![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`.

### 卡片 113

**问题**

Thr → amino-acid name

**答案**

Threonine

### 卡片 114

**问题**

Q → amino-acid name

**答案**

Glutamine

### 卡片 115

**问题**

Tryptophan → draw or recall the side chain

**答案**

![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`.

### 卡片 116

**问题**

Met → amino-acid name

**答案**

Methionine

### 卡片 117

**问题**

G → amino-acid name

**答案**

Glycine

### 卡片 118

**问题**

Glutamate → draw or recall the side chain

**答案**

![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`.

### 卡片 119

**问题**

H → amino-acid name

**答案**

Histidine

### 卡片 120

**问题**

Valine → draw or recall the side chain

**答案**

![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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