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Amino Acid Flashcards: 20 Side-Chain Structures & Codes

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.

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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, NCBI’s overview of amino acids and their side chains, and the NCBI amino-acid code table 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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  1. Kaart 1

    Küsimus

    Side-chain diagram showing CH₂ joined to a five-membered ring containing NH and N from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

    Histidine — side chain: Cα–CH₂–imidazolyl.

  2. Kaart 2

    Küsimus

    Valine → three-letter code

    Vastus

    Val

  3. Kaart 3

    Küsimus

    Serine → one-letter code

    Vastus

    S

  4. Kaart 4

    Küsimus

    Side-chain diagram showing CH₂–C(=O)–NH₂ from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  5. Kaart 5

    Küsimus

    Phenylalanine → three-letter code

    Vastus

    Phe

  6. Kaart 6

    Küsimus

    Lysine → one-letter code

    Vastus

    K

  7. Kaart 7

    Küsimus

    Side-chain diagram showing one CH₃ group bonded to the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

    Alanine — side chain: Cα–CH₃.

  8. Kaart 8

    Küsimus

    Isoleucine → three-letter code

    Vastus

    Ile

  9. Kaart 9

    Küsimus

    Cysteine → one-letter code

    Vastus

    C

  10. Kaart 10

    Küsimus

    Side-chain diagram showing CH₂–C(=O)–OH from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  11. Kaart 11

    Küsimus

    Tyrosine → three-letter code

    Vastus

    Tyr

  12. Kaart 12

    Küsimus

    Arginine → one-letter code

    Vastus

    R

  13. Kaart 13

    Küsimus

    Side-chain diagram showing three CH₂ groups linking the Cα and Nα attachment markers.

    Which amino acid has this side chain?

    Vastus

    Proline — side chain: Cα–(CH₂)₃–Nα.

  14. Kaart 14

    Küsimus

    Leucine → three-letter code

    Vastus

    Leu

  15. Kaart 15

    Küsimus

    Threonine → one-letter code

    Vastus

    T

  16. Kaart 16

    Küsimus

    Side-chain diagram showing CH₂–CH₂–C(=O)–NH₂ from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  17. Kaart 17

    Küsimus

    Tryptophan → three-letter code

    Vastus

    Trp

  18. Kaart 18

    Küsimus

    Methionine → one-letter code

    Vastus

    M

  19. Kaart 19

    Küsimus

    Side-chain diagram showing a hydrogen bonded to the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

    Glycine — side chain: Cα–H.

  20. Kaart 20

    Küsimus

    Glutamate → three-letter code

    Vastus

    Glu

  21. Kaart 21

    Küsimus

    Val → amino-acid name

    Vastus

    Valine

  22. Kaart 22

    Küsimus

    S → amino-acid name

    Vastus

    Serine

  23. Kaart 23

    Küsimus

    Asparagine → three-letter code

    Vastus

    Asn

  24. Kaart 24

    Küsimus

    Phenylalanine → one-letter code

    Vastus

    F

  25. Kaart 25

    Küsimus

    Side-chain diagram showing (CH₂)₄–NH₂ from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

    Lysine — side chain: Cα–(CH₂)₄–NH₂.

  26. Kaart 26

    Küsimus

    Alanine → draw or recall the side chain

    Vastus

    Side-chain diagram showing one CH₃ group bonded to the Cα attachment marker.

    Side chain: Cα–CH₃.

  27. Kaart 27

    Küsimus

    Ile → amino-acid name

    Vastus

    Isoleucine

  28. Kaart 28

    Küsimus

    C → amino-acid name

    Vastus

    Cysteine

  29. Kaart 29

    Küsimus

    Aspartate → three-letter code

    Vastus

    Asp

  30. Kaart 30

    Küsimus

    Tyrosine → one-letter code

    Vastus

    Y

  31. Kaart 31

    Küsimus

    Side-chain diagram showing (CH₂)₃–NH–C(=NH)–NH₂ from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  32. Kaart 32

    Küsimus

    Proline → draw or recall the side chain

    Vastus

    Side-chain diagram showing three CH₂ groups linking the Cα and Nα attachment markers.

    Side chain: Cα–(CH₂)₃–Nα.

  33. Kaart 33

    Küsimus

    Leu → amino-acid name

    Vastus

    Leucine

  34. Kaart 34

    Küsimus

    T → amino-acid name

    Vastus

    Threonine

  35. Kaart 35

    Küsimus

    Glutamine → three-letter code

    Vastus

    Gln

  36. Kaart 36

    Küsimus

    Tryptophan → one-letter code

    Vastus

    W

  37. Kaart 37

    Küsimus

    Side-chain diagram showing CH₂–CH₂–S–CH₃ from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  38. Kaart 38

    Küsimus

    Glycine → draw or recall the side chain

    Vastus

    Side-chain diagram showing a hydrogen bonded to the Cα attachment marker.

    Side chain: Cα–H.

  39. Kaart 39

    Küsimus

    Glu → amino-acid name

    Vastus

    Glutamate

  40. Kaart 40

    Küsimus

    Histidine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂ joined to a five-membered ring containing NH and N from the Cα attachment marker.

    Side chain: Cα–CH₂–imidazolyl.

  41. Kaart 41

    Küsimus

    K → amino-acid name

    Vastus

    Lysine

  42. Kaart 42

    Küsimus

    Alanine → three-letter code

    Vastus

    Ala

  43. Kaart 43

    Küsimus

    Isoleucine → one-letter code

    Vastus

    I

  44. Kaart 44

    Küsimus

    Side-chain diagram showing CH₂–SH from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

    Cysteine — side chain: Cα–CH₂–SH.

  45. Kaart 45

    Küsimus

    Aspartate → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂–C(=O)–OH from the Cα attachment marker.

    Side chain: Cα–CH₂–C(=O)–OH.

  46. Kaart 46

    Küsimus

    Tyr → amino-acid name

    Vastus

    Tyrosine

  47. Kaart 47

    Küsimus

    R → amino-acid name

    Vastus

    Arginine

  48. Kaart 48

    Küsimus

    Proline → three-letter code

    Vastus

    Pro

  49. Kaart 49

    Küsimus

    Leucine → one-letter code

    Vastus

    L

  50. Kaart 50

    Küsimus

    Side-chain diagram showing CH bonded to OH and CH₃ from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  51. Kaart 51

    Küsimus

    Glutamine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂–CH₂–C(=O)–NH₂ from the Cα attachment marker.

    Side chain: Cα–CH₂–CH₂–C(=O)–NH₂.

  52. Kaart 52

    Küsimus

    Trp → amino-acid name

    Vastus

    Tryptophan

  53. Kaart 53

    Küsimus

    M → amino-acid name

    Vastus

    Methionine

  54. Kaart 54

    Küsimus

    Glycine → three-letter code

    Vastus

    Gly

  55. Kaart 55

    Küsimus

    Glutamate → one-letter code

    Vastus

    E

  56. Kaart 56

    Küsimus

    Histidine → three-letter code

    Vastus

    His

  57. Kaart 57

    Küsimus

    Valine → one-letter code

    Vastus

    V

  58. Kaart 58

    Küsimus

    Side-chain diagram showing CH₂–OH from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

    Serine — side chain: Cα–CH₂–OH.

  59. Kaart 59

    Küsimus

    Asparagine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂–C(=O)–NH₂ from the Cα attachment marker.

    Side chain: Cα–CH₂–C(=O)–NH₂.

  60. Kaart 60

    Küsimus

    Phe → amino-acid name

    Vastus

    Phenylalanine

    Abstract molecular study scene with colorful ball-and-stick side-chain forms arranged around an open center.

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    Amino Acid Flashcards: 20 Side-Chain Structures & Codes

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  61. Kaart 61

    Küsimus

    I → amino-acid name

    Vastus

    Isoleucine

  62. Kaart 62

    Küsimus

    Cysteine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂–SH from the Cα attachment marker.

    Side chain: Cα–CH₂–SH.

  63. Kaart 63

    Küsimus

    Aspartate → one-letter code

    Vastus

    D

  64. Kaart 64

    Küsimus

    Side-chain diagram showing CH₂ joined to a six-membered ring with an opposite OH group from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  65. Kaart 65

    Küsimus

    Arginine → three-letter code

    Vastus

    Arg

  66. Kaart 66

    Küsimus

    Pro → amino-acid name

    Vastus

    Proline

  67. Kaart 67

    Küsimus

    L → amino-acid name

    Vastus

    Leucine

  68. Kaart 68

    Küsimus

    Threonine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH bonded to OH and CH₃ from the Cα attachment marker.

    Side chain: Cα–CH(OH)–CH₃.

  69. Kaart 69

    Küsimus

    Glutamine → one-letter code

    Vastus

    Q

  70. Kaart 70

    Küsimus

    Side-chain diagram showing the Cα attachment marker joined through CH₂ to position 3 of fused five- and six-membered rings containing NH.

    Which amino acid has this side chain?

    Vastus

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

  71. Kaart 71

    Küsimus

    Methionine → three-letter code

    Vastus

    Met

  72. Kaart 72

    Küsimus

    Gly → amino-acid name

    Vastus

    Glycine

  73. Kaart 73

    Küsimus

    E → amino-acid name

    Vastus

    Glutamate

  74. Kaart 74

    Küsimus

    His → amino-acid name

    Vastus

    Histidine

  75. Kaart 75

    Küsimus

    V → amino-acid name

    Vastus

    Valine

  76. Kaart 76

    Küsimus

    Serine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂–OH from the Cα attachment marker.

    Side chain: Cα–CH₂–OH.

  77. Kaart 77

    Küsimus

    Asparagine → one-letter code

    Vastus

    N

  78. Kaart 78

    Küsimus

    Side-chain diagram showing CH₂ joined to a six-membered ring with alternating double bonds from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

    Phenylalanine — side chain: Cα–CH₂–C₆H₅.

  79. Kaart 79

    Küsimus

    Lysine → three-letter code

    Vastus

    Lys

  80. Kaart 80

    Küsimus

    Ala → amino-acid name

    Vastus

    Alanine

  81. Kaart 81

    Küsimus

    Proline → one-letter code

    Vastus

    P

  82. Kaart 82

    Küsimus

    Side-chain diagram showing CH₂–CH with two terminal CH₃ branches from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  83. Kaart 83

    Küsimus

    Threonine → three-letter code

    Vastus

    Thr

  84. Kaart 84

    Küsimus

    Gln → amino-acid name

    Vastus

    Glutamine

  85. Kaart 85

    Küsimus

    W → amino-acid name

    Vastus

    Tryptophan

  86. Kaart 86

    Küsimus

    Methionine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂–CH₂–S–CH₃ from the Cα attachment marker.

    Side chain: Cα–CH₂–CH₂–S–CH₃.

  87. Kaart 87

    Küsimus

    Glycine → one-letter code

    Vastus

    G

  88. Kaart 88

    Küsimus

    Side-chain diagram showing CH₂–CH₂–C(=O)–OH from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  89. Kaart 89

    Küsimus

    Histidine → one-letter code

    Vastus

    H

  90. Kaart 90

    Küsimus

    Side-chain diagram showing CH bonded to two CH₃ branches from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

    Valine — side chain: Cα–CH(CH₃)₂.

  91. Kaart 91

    Küsimus

    Serine → three-letter code

    Vastus

    Ser

  92. Kaart 92

    Küsimus

    Asn → amino-acid name

    Vastus

    Asparagine

  93. Kaart 93

    Küsimus

    F → amino-acid name

    Vastus

    Phenylalanine

  94. Kaart 94

    Küsimus

    Lysine → draw or recall the side chain

    Vastus

    Side-chain diagram showing (CH₂)₄–NH₂ from the Cα attachment marker.

    Side chain: Cα–(CH₂)₄–NH₂.

  95. Kaart 95

    Küsimus

    Alanine → one-letter code

    Vastus

    A

  96. Kaart 96

    Küsimus

    Side-chain diagram showing CH with one CH₃ branch and one CH₂–CH₃ branch from the Cα attachment marker.

    Which amino acid has this side chain?

    Vastus

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

  97. Kaart 97

    Küsimus

    Cysteine → three-letter code

    Vastus

    Cys

  98. Kaart 98

    Küsimus

    Asp → amino-acid name

    Vastus

    Aspartate

  99. Kaart 99

    Küsimus

    Y → amino-acid name

    Vastus

    Tyrosine

  100. Kaart 100

    Küsimus

    Arginine → draw or recall the side chain

    Vastus

    Side-chain diagram showing (CH₂)₃–NH–C(=NH)–NH₂ from the Cα attachment marker.

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

  101. Kaart 101

    Küsimus

    Ser → amino-acid name

    Vastus

    Serine

  102. Kaart 102

    Küsimus

    N → amino-acid name

    Vastus

    Asparagine

  103. Kaart 103

    Küsimus

    Phenylalanine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂ joined to a six-membered ring with alternating double bonds from the Cα attachment marker.

    Side chain: Cα–CH₂–C₆H₅.

  104. Kaart 104

    Küsimus

    Lys → amino-acid name

    Vastus

    Lysine

  105. Kaart 105

    Küsimus

    A → amino-acid name

    Vastus

    Alanine

  106. Kaart 106

    Küsimus

    Isoleucine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH with one CH₃ branch and one CH₂–CH₃ branch from the Cα attachment marker.

    Side chain: Cα–CH(CH₃)–CH₂–CH₃.

  107. Kaart 107

    Küsimus

    Cys → amino-acid name

    Vastus

    Cysteine

  108. Kaart 108

    Küsimus

    D → amino-acid name

    Vastus

    Aspartate

  109. Kaart 109

    Küsimus

    Tyrosine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂ joined to a six-membered ring with an opposite OH group from the Cα attachment marker.

    Side chain: Cα–CH₂–C₆H₄–OH (para).

  110. Kaart 110

    Küsimus

    Arg → amino-acid name

    Vastus

    Arginine

  111. Kaart 111

    Küsimus

    P → amino-acid name

    Vastus

    Proline

  112. Kaart 112

    Küsimus

    Leucine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂–CH with two terminal CH₃ branches from the Cα attachment marker.

    Side chain: Cα–CH₂–CH(CH₃)₂.

  113. Kaart 113

    Küsimus

    Thr → amino-acid name

    Vastus

    Threonine

  114. Kaart 114

    Küsimus

    Q → amino-acid name

    Vastus

    Glutamine

  115. Kaart 115

    Küsimus

    Tryptophan → draw or recall the side chain

    Vastus

    Side-chain diagram showing the Cα attachment marker joined through CH₂ to position 3 of fused five- and six-membered rings containing NH.

    Side chain: Cα–CH₂–indol-3-yl.

  116. Kaart 116

    Küsimus

    Met → amino-acid name

    Vastus

    Methionine

  117. Kaart 117

    Küsimus

    G → amino-acid name

    Vastus

    Glycine

  118. Kaart 118

    Küsimus

    Glutamate → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH₂–CH₂–C(=O)–OH from the Cα attachment marker.

    Side chain: Cα–CH₂–CH₂–C(=O)–OH.

  119. Kaart 119

    Küsimus

    H → amino-acid name

    Vastus

    Histidine

  120. Kaart 120

    Küsimus

    Valine → draw or recall the side chain

    Vastus

    Side-chain diagram showing CH bonded to two CH₃ branches from the Cα attachment marker.

    Side chain: Cα–CH(CH₃)₂.

Abstract molecular study scene with colorful ball-and-stick side-chain forms arranged around an open center.

120 kaarti

Amino Acid Flashcards: 20 Side-Chain Structures & Codes

Õpi seda kaardipakki tasuta

Nibomo avaneb, et saaksid õppimist alustada.