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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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À propos de ce paquet

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.

Cartes de ce paquet

  1. Carte 1

    Question

    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?

    Réponse

    Histidine — side chain: Cα–CH₂–imidazolyl.

  2. Carte 2

    Question

    Valine → three-letter code

    Réponse

    Val

  3. Carte 3

    Question

    Serine → one-letter code

    Réponse

    S

  4. Carte 4

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  5. Carte 5

    Question

    Phenylalanine → three-letter code

    Réponse

    Phe

  6. Carte 6

    Question

    Lysine → one-letter code

    Réponse

    K

  7. Carte 7

    Question

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

    Which amino acid has this side chain?

    Réponse

    Alanine — side chain: Cα–CH₃.

  8. Carte 8

    Question

    Isoleucine → three-letter code

    Réponse

    Ile

  9. Carte 9

    Question

    Cysteine → one-letter code

    Réponse

    C

  10. Carte 10

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  11. Carte 11

    Question

    Tyrosine → three-letter code

    Réponse

    Tyr

  12. Carte 12

    Question

    Arginine → one-letter code

    Réponse

    R

  13. Carte 13

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  14. Carte 14

    Question

    Leucine → three-letter code

    Réponse

    Leu

  15. Carte 15

    Question

    Threonine → one-letter code

    Réponse

    T

  16. Carte 16

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  17. Carte 17

    Question

    Tryptophan → three-letter code

    Réponse

    Trp

  18. Carte 18

    Question

    Methionine → one-letter code

    Réponse

    M

  19. Carte 19

    Question

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

    Which amino acid has this side chain?

    Réponse

    Glycine — side chain: Cα–H.

  20. Carte 20

    Question

    Glutamate → three-letter code

    Réponse

    Glu

  21. Carte 21

    Question

    Val → amino-acid name

    Réponse

    Valine

  22. Carte 22

    Question

    S → amino-acid name

    Réponse

    Serine

  23. Carte 23

    Question

    Asparagine → three-letter code

    Réponse

    Asn

  24. Carte 24

    Question

    Phenylalanine → one-letter code

    Réponse

    F

  25. Carte 25

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  26. Carte 26

    Question

    Alanine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₃.

  27. Carte 27

    Question

    Ile → amino-acid name

    Réponse

    Isoleucine

  28. Carte 28

    Question

    C → amino-acid name

    Réponse

    Cysteine

  29. Carte 29

    Question

    Aspartate → three-letter code

    Réponse

    Asp

  30. Carte 30

    Question

    Tyrosine → one-letter code

    Réponse

    Y

  31. Carte 31

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  32. Carte 32

    Question

    Proline → draw or recall the side chain

    Réponse

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

    Side chain: Cα–(CH₂)₃–Nα.

  33. Carte 33

    Question

    Leu → amino-acid name

    Réponse

    Leucine

  34. Carte 34

    Question

    T → amino-acid name

    Réponse

    Threonine

  35. Carte 35

    Question

    Glutamine → three-letter code

    Réponse

    Gln

  36. Carte 36

    Question

    Tryptophan → one-letter code

    Réponse

    W

  37. Carte 37

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  38. Carte 38

    Question

    Glycine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–H.

  39. Carte 39

    Question

    Glu → amino-acid name

    Réponse

    Glutamate

  40. Carte 40

    Question

    Histidine → draw or recall the side chain

    Réponse

    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. Carte 41

    Question

    K → amino-acid name

    Réponse

    Lysine

  42. Carte 42

    Question

    Alanine → three-letter code

    Réponse

    Ala

  43. Carte 43

    Question

    Isoleucine → one-letter code

    Réponse

    I

  44. Carte 44

    Question

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

    Which amino acid has this side chain?

    Réponse

    Cysteine — side chain: Cα–CH₂–SH.

  45. Carte 45

    Question

    Aspartate → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₂–C(=O)–OH.

  46. Carte 46

    Question

    Tyr → amino-acid name

    Réponse

    Tyrosine

  47. Carte 47

    Question

    R → amino-acid name

    Réponse

    Arginine

  48. Carte 48

    Question

    Proline → three-letter code

    Réponse

    Pro

  49. Carte 49

    Question

    Leucine → one-letter code

    Réponse

    L

  50. Carte 50

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  51. Carte 51

    Question

    Glutamine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₂–CH₂–C(=O)–NH₂.

  52. Carte 52

    Question

    Trp → amino-acid name

    Réponse

    Tryptophan

  53. Carte 53

    Question

    M → amino-acid name

    Réponse

    Methionine

  54. Carte 54

    Question

    Glycine → three-letter code

    Réponse

    Gly

  55. Carte 55

    Question

    Glutamate → one-letter code

    Réponse

    E

  56. Carte 56

    Question

    Histidine → three-letter code

    Réponse

    His

  57. Carte 57

    Question

    Valine → one-letter code

    Réponse

    V

  58. Carte 58

    Question

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

    Which amino acid has this side chain?

    Réponse

    Serine — side chain: Cα–CH₂–OH.

  59. Carte 59

    Question

    Asparagine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₂–C(=O)–NH₂.

  60. Carte 60

    Question

    Phe → amino-acid name

    Réponse

    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. Carte 61

    Question

    I → amino-acid name

    Réponse

    Isoleucine

  62. Carte 62

    Question

    Cysteine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₂–SH.

  63. Carte 63

    Question

    Aspartate → one-letter code

    Réponse

    D

  64. Carte 64

    Question

    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?

    Réponse

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

  65. Carte 65

    Question

    Arginine → three-letter code

    Réponse

    Arg

  66. Carte 66

    Question

    Pro → amino-acid name

    Réponse

    Proline

  67. Carte 67

    Question

    L → amino-acid name

    Réponse

    Leucine

  68. Carte 68

    Question

    Threonine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH(OH)–CH₃.

  69. Carte 69

    Question

    Glutamine → one-letter code

    Réponse

    Q

  70. Carte 70

    Question

    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?

    Réponse

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

  71. Carte 71

    Question

    Methionine → three-letter code

    Réponse

    Met

  72. Carte 72

    Question

    Gly → amino-acid name

    Réponse

    Glycine

  73. Carte 73

    Question

    E → amino-acid name

    Réponse

    Glutamate

  74. Carte 74

    Question

    His → amino-acid name

    Réponse

    Histidine

  75. Carte 75

    Question

    V → amino-acid name

    Réponse

    Valine

  76. Carte 76

    Question

    Serine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₂–OH.

  77. Carte 77

    Question

    Asparagine → one-letter code

    Réponse

    N

  78. Carte 78

    Question

    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?

    Réponse

    Phenylalanine — side chain: Cα–CH₂–C₆H₅.

  79. Carte 79

    Question

    Lysine → three-letter code

    Réponse

    Lys

  80. Carte 80

    Question

    Ala → amino-acid name

    Réponse

    Alanine

  81. Carte 81

    Question

    Proline → one-letter code

    Réponse

    P

  82. Carte 82

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  83. Carte 83

    Question

    Threonine → three-letter code

    Réponse

    Thr

  84. Carte 84

    Question

    Gln → amino-acid name

    Réponse

    Glutamine

  85. Carte 85

    Question

    W → amino-acid name

    Réponse

    Tryptophan

  86. Carte 86

    Question

    Methionine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₂–CH₂–S–CH₃.

  87. Carte 87

    Question

    Glycine → one-letter code

    Réponse

    G

  88. Carte 88

    Question

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

    Which amino acid has this side chain?

    Réponse

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

  89. Carte 89

    Question

    Histidine → one-letter code

    Réponse

    H

  90. Carte 90

    Question

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

    Which amino acid has this side chain?

    Réponse

    Valine — side chain: Cα–CH(CH₃)₂.

  91. Carte 91

    Question

    Serine → three-letter code

    Réponse

    Ser

  92. Carte 92

    Question

    Asn → amino-acid name

    Réponse

    Asparagine

  93. Carte 93

    Question

    F → amino-acid name

    Réponse

    Phenylalanine

  94. Carte 94

    Question

    Lysine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–(CH₂)₄–NH₂.

  95. Carte 95

    Question

    Alanine → one-letter code

    Réponse

    A

  96. Carte 96

    Question

    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?

    Réponse

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

  97. Carte 97

    Question

    Cysteine → three-letter code

    Réponse

    Cys

  98. Carte 98

    Question

    Asp → amino-acid name

    Réponse

    Aspartate

  99. Carte 99

    Question

    Y → amino-acid name

    Réponse

    Tyrosine

  100. Carte 100

    Question

    Arginine → draw or recall the side chain

    Réponse

    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. Carte 101

    Question

    Ser → amino-acid name

    Réponse

    Serine

  102. Carte 102

    Question

    N → amino-acid name

    Réponse

    Asparagine

  103. Carte 103

    Question

    Phenylalanine → draw or recall the side chain

    Réponse

    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. Carte 104

    Question

    Lys → amino-acid name

    Réponse

    Lysine

  105. Carte 105

    Question

    A → amino-acid name

    Réponse

    Alanine

  106. Carte 106

    Question

    Isoleucine → draw or recall the side chain

    Réponse

    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. Carte 107

    Question

    Cys → amino-acid name

    Réponse

    Cysteine

  108. Carte 108

    Question

    D → amino-acid name

    Réponse

    Aspartate

  109. Carte 109

    Question

    Tyrosine → draw or recall the side chain

    Réponse

    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. Carte 110

    Question

    Arg → amino-acid name

    Réponse

    Arginine

  111. Carte 111

    Question

    P → amino-acid name

    Réponse

    Proline

  112. Carte 112

    Question

    Leucine → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₂–CH(CH₃)₂.

  113. Carte 113

    Question

    Thr → amino-acid name

    Réponse

    Threonine

  114. Carte 114

    Question

    Q → amino-acid name

    Réponse

    Glutamine

  115. Carte 115

    Question

    Tryptophan → draw or recall the side chain

    Réponse

    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. Carte 116

    Question

    Met → amino-acid name

    Réponse

    Methionine

  117. Carte 117

    Question

    G → amino-acid name

    Réponse

    Glycine

  118. Carte 118

    Question

    Glutamate → draw or recall the side chain

    Réponse

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

    Side chain: Cα–CH₂–CH₂–C(=O)–OH.

  119. Carte 119

    Question

    H → amino-acid name

    Réponse

    Histidine

  120. Carte 120

    Question

    Valine → draw or recall the side chain

    Réponse

    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 cartes

Amino Acid Flashcards: 20 Side-Chain Structures & Codes

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