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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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Om den här kortleken

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.

Kort i den här kortleken

  1. Kort 1

    Fråga

    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?

    Svar

    Histidine — side chain: Cα–CH₂–imidazolyl.

  2. Kort 2

    Fråga

    Valine → three-letter code

    Svar

    Val

  3. Kort 3

    Fråga

    Serine → one-letter code

    Svar

    S

  4. Kort 4

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  5. Kort 5

    Fråga

    Phenylalanine → three-letter code

    Svar

    Phe

  6. Kort 6

    Fråga

    Lysine → one-letter code

    Svar

    K

  7. Kort 7

    Fråga

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

    Which amino acid has this side chain?

    Svar

    Alanine — side chain: Cα–CH₃.

  8. Kort 8

    Fråga

    Isoleucine → three-letter code

    Svar

    Ile

  9. Kort 9

    Fråga

    Cysteine → one-letter code

    Svar

    C

  10. Kort 10

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  11. Kort 11

    Fråga

    Tyrosine → three-letter code

    Svar

    Tyr

  12. Kort 12

    Fråga

    Arginine → one-letter code

    Svar

    R

  13. Kort 13

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  14. Kort 14

    Fråga

    Leucine → three-letter code

    Svar

    Leu

  15. Kort 15

    Fråga

    Threonine → one-letter code

    Svar

    T

  16. Kort 16

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  17. Kort 17

    Fråga

    Tryptophan → three-letter code

    Svar

    Trp

  18. Kort 18

    Fråga

    Methionine → one-letter code

    Svar

    M

  19. Kort 19

    Fråga

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

    Which amino acid has this side chain?

    Svar

    Glycine — side chain: Cα–H.

  20. Kort 20

    Fråga

    Glutamate → three-letter code

    Svar

    Glu

  21. Kort 21

    Fråga

    Val → amino-acid name

    Svar

    Valine

  22. Kort 22

    Fråga

    S → amino-acid name

    Svar

    Serine

  23. Kort 23

    Fråga

    Asparagine → three-letter code

    Svar

    Asn

  24. Kort 24

    Fråga

    Phenylalanine → one-letter code

    Svar

    F

  25. Kort 25

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  26. Kort 26

    Fråga

    Alanine → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₃.

  27. Kort 27

    Fråga

    Ile → amino-acid name

    Svar

    Isoleucine

  28. Kort 28

    Fråga

    C → amino-acid name

    Svar

    Cysteine

  29. Kort 29

    Fråga

    Aspartate → three-letter code

    Svar

    Asp

  30. Kort 30

    Fråga

    Tyrosine → one-letter code

    Svar

    Y

  31. Kort 31

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  32. Kort 32

    Fråga

    Proline → draw or recall the side chain

    Svar

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

    Side chain: Cα–(CH₂)₃–Nα.

  33. Kort 33

    Fråga

    Leu → amino-acid name

    Svar

    Leucine

  34. Kort 34

    Fråga

    T → amino-acid name

    Svar

    Threonine

  35. Kort 35

    Fråga

    Glutamine → three-letter code

    Svar

    Gln

  36. Kort 36

    Fråga

    Tryptophan → one-letter code

    Svar

    W

  37. Kort 37

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  38. Kort 38

    Fråga

    Glycine → draw or recall the side chain

    Svar

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

    Side chain: Cα–H.

  39. Kort 39

    Fråga

    Glu → amino-acid name

    Svar

    Glutamate

  40. Kort 40

    Fråga

    Histidine → draw or recall the side chain

    Svar

    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. Kort 41

    Fråga

    K → amino-acid name

    Svar

    Lysine

  42. Kort 42

    Fråga

    Alanine → three-letter code

    Svar

    Ala

  43. Kort 43

    Fråga

    Isoleucine → one-letter code

    Svar

    I

  44. Kort 44

    Fråga

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

    Which amino acid has this side chain?

    Svar

    Cysteine — side chain: Cα–CH₂–SH.

  45. Kort 45

    Fråga

    Aspartate → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₂–C(=O)–OH.

  46. Kort 46

    Fråga

    Tyr → amino-acid name

    Svar

    Tyrosine

  47. Kort 47

    Fråga

    R → amino-acid name

    Svar

    Arginine

  48. Kort 48

    Fråga

    Proline → three-letter code

    Svar

    Pro

  49. Kort 49

    Fråga

    Leucine → one-letter code

    Svar

    L

  50. Kort 50

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  51. Kort 51

    Fråga

    Glutamine → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₂–CH₂–C(=O)–NH₂.

  52. Kort 52

    Fråga

    Trp → amino-acid name

    Svar

    Tryptophan

  53. Kort 53

    Fråga

    M → amino-acid name

    Svar

    Methionine

  54. Kort 54

    Fråga

    Glycine → three-letter code

    Svar

    Gly

  55. Kort 55

    Fråga

    Glutamate → one-letter code

    Svar

    E

  56. Kort 56

    Fråga

    Histidine → three-letter code

    Svar

    His

  57. Kort 57

    Fråga

    Valine → one-letter code

    Svar

    V

  58. Kort 58

    Fråga

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

    Which amino acid has this side chain?

    Svar

    Serine — side chain: Cα–CH₂–OH.

  59. Kort 59

    Fråga

    Asparagine → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₂–C(=O)–NH₂.

  60. Kort 60

    Fråga

    Phe → amino-acid name

    Svar

    Phenylalanine

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

    120 kort

    Amino Acid Flashcards: 20 Side-Chain Structures & Codes

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  61. Kort 61

    Fråga

    I → amino-acid name

    Svar

    Isoleucine

  62. Kort 62

    Fråga

    Cysteine → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₂–SH.

  63. Kort 63

    Fråga

    Aspartate → one-letter code

    Svar

    D

  64. Kort 64

    Fråga

    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?

    Svar

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

  65. Kort 65

    Fråga

    Arginine → three-letter code

    Svar

    Arg

  66. Kort 66

    Fråga

    Pro → amino-acid name

    Svar

    Proline

  67. Kort 67

    Fråga

    L → amino-acid name

    Svar

    Leucine

  68. Kort 68

    Fråga

    Threonine → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH(OH)–CH₃.

  69. Kort 69

    Fråga

    Glutamine → one-letter code

    Svar

    Q

  70. Kort 70

    Fråga

    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?

    Svar

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

  71. Kort 71

    Fråga

    Methionine → three-letter code

    Svar

    Met

  72. Kort 72

    Fråga

    Gly → amino-acid name

    Svar

    Glycine

  73. Kort 73

    Fråga

    E → amino-acid name

    Svar

    Glutamate

  74. Kort 74

    Fråga

    His → amino-acid name

    Svar

    Histidine

  75. Kort 75

    Fråga

    V → amino-acid name

    Svar

    Valine

  76. Kort 76

    Fråga

    Serine → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₂–OH.

  77. Kort 77

    Fråga

    Asparagine → one-letter code

    Svar

    N

  78. Kort 78

    Fråga

    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?

    Svar

    Phenylalanine — side chain: Cα–CH₂–C₆H₅.

  79. Kort 79

    Fråga

    Lysine → three-letter code

    Svar

    Lys

  80. Kort 80

    Fråga

    Ala → amino-acid name

    Svar

    Alanine

  81. Kort 81

    Fråga

    Proline → one-letter code

    Svar

    P

  82. Kort 82

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  83. Kort 83

    Fråga

    Threonine → three-letter code

    Svar

    Thr

  84. Kort 84

    Fråga

    Gln → amino-acid name

    Svar

    Glutamine

  85. Kort 85

    Fråga

    W → amino-acid name

    Svar

    Tryptophan

  86. Kort 86

    Fråga

    Methionine → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₂–CH₂–S–CH₃.

  87. Kort 87

    Fråga

    Glycine → one-letter code

    Svar

    G

  88. Kort 88

    Fråga

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

    Which amino acid has this side chain?

    Svar

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

  89. Kort 89

    Fråga

    Histidine → one-letter code

    Svar

    H

  90. Kort 90

    Fråga

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

    Which amino acid has this side chain?

    Svar

    Valine — side chain: Cα–CH(CH₃)₂.

  91. Kort 91

    Fråga

    Serine → three-letter code

    Svar

    Ser

  92. Kort 92

    Fråga

    Asn → amino-acid name

    Svar

    Asparagine

  93. Kort 93

    Fråga

    F → amino-acid name

    Svar

    Phenylalanine

  94. Kort 94

    Fråga

    Lysine → draw or recall the side chain

    Svar

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

    Side chain: Cα–(CH₂)₄–NH₂.

  95. Kort 95

    Fråga

    Alanine → one-letter code

    Svar

    A

  96. Kort 96

    Fråga

    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?

    Svar

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

  97. Kort 97

    Fråga

    Cysteine → three-letter code

    Svar

    Cys

  98. Kort 98

    Fråga

    Asp → amino-acid name

    Svar

    Aspartate

  99. Kort 99

    Fråga

    Y → amino-acid name

    Svar

    Tyrosine

  100. Kort 100

    Fråga

    Arginine → draw or recall the side chain

    Svar

    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. Kort 101

    Fråga

    Ser → amino-acid name

    Svar

    Serine

  102. Kort 102

    Fråga

    N → amino-acid name

    Svar

    Asparagine

  103. Kort 103

    Fråga

    Phenylalanine → draw or recall the side chain

    Svar

    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. Kort 104

    Fråga

    Lys → amino-acid name

    Svar

    Lysine

  105. Kort 105

    Fråga

    A → amino-acid name

    Svar

    Alanine

  106. Kort 106

    Fråga

    Isoleucine → draw or recall the side chain

    Svar

    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. Kort 107

    Fråga

    Cys → amino-acid name

    Svar

    Cysteine

  108. Kort 108

    Fråga

    D → amino-acid name

    Svar

    Aspartate

  109. Kort 109

    Fråga

    Tyrosine → draw or recall the side chain

    Svar

    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. Kort 110

    Fråga

    Arg → amino-acid name

    Svar

    Arginine

  111. Kort 111

    Fråga

    P → amino-acid name

    Svar

    Proline

  112. Kort 112

    Fråga

    Leucine → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₂–CH(CH₃)₂.

  113. Kort 113

    Fråga

    Thr → amino-acid name

    Svar

    Threonine

  114. Kort 114

    Fråga

    Q → amino-acid name

    Svar

    Glutamine

  115. Kort 115

    Fråga

    Tryptophan → draw or recall the side chain

    Svar

    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. Kort 116

    Fråga

    Met → amino-acid name

    Svar

    Methionine

  117. Kort 117

    Fråga

    G → amino-acid name

    Svar

    Glycine

  118. Kort 118

    Fråga

    Glutamate → draw or recall the side chain

    Svar

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

    Side chain: Cα–CH₂–CH₂–C(=O)–OH.

  119. Kort 119

    Fråga

    H → amino-acid name

    Svar

    Histidine

  120. Kort 120

    Fråga

    Valine → draw or recall the side chain

    Svar

    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 kort

Amino Acid Flashcards: 20 Side-Chain Structures & Codes

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