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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.

Spjöld í þessum stokki

  1. Spjald 1

    Spurning

    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. Spjald 2

    Spurning

    Valine → three-letter code

    Svar

    Val

  3. Spjald 3

    Spurning

    Serine → one-letter code

    Svar

    S

  4. Spjald 4

    Spurning

    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. Spjald 5

    Spurning

    Phenylalanine → three-letter code

    Svar

    Phe

  6. Spjald 6

    Spurning

    Lysine → one-letter code

    Svar

    K

  7. Spjald 7

    Spurning

    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. Spjald 8

    Spurning

    Isoleucine → three-letter code

    Svar

    Ile

  9. Spjald 9

    Spurning

    Cysteine → one-letter code

    Svar

    C

  10. Spjald 10

    Spurning

    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. Spjald 11

    Spurning

    Tyrosine → three-letter code

    Svar

    Tyr

  12. Spjald 12

    Spurning

    Arginine → one-letter code

    Svar

    R

  13. Spjald 13

    Spurning

    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. Spjald 14

    Spurning

    Leucine → three-letter code

    Svar

    Leu

  15. Spjald 15

    Spurning

    Threonine → one-letter code

    Svar

    T

  16. Spjald 16

    Spurning

    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. Spjald 17

    Spurning

    Tryptophan → three-letter code

    Svar

    Trp

  18. Spjald 18

    Spurning

    Methionine → one-letter code

    Svar

    M

  19. Spjald 19

    Spurning

    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. Spjald 20

    Spurning

    Glutamate → three-letter code

    Svar

    Glu

  21. Spjald 21

    Spurning

    Val → amino-acid name

    Svar

    Valine

  22. Spjald 22

    Spurning

    S → amino-acid name

    Svar

    Serine

  23. Spjald 23

    Spurning

    Asparagine → three-letter code

    Svar

    Asn

  24. Spjald 24

    Spurning

    Phenylalanine → one-letter code

    Svar

    F

  25. Spjald 25

    Spurning

    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. Spjald 26

    Spurning

    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. Spjald 27

    Spurning

    Ile → amino-acid name

    Svar

    Isoleucine

  28. Spjald 28

    Spurning

    C → amino-acid name

    Svar

    Cysteine

  29. Spjald 29

    Spurning

    Aspartate → three-letter code

    Svar

    Asp

  30. Spjald 30

    Spurning

    Tyrosine → one-letter code

    Svar

    Y

  31. Spjald 31

    Spurning

    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. Spjald 32

    Spurning

    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. Spjald 33

    Spurning

    Leu → amino-acid name

    Svar

    Leucine

  34. Spjald 34

    Spurning

    T → amino-acid name

    Svar

    Threonine

  35. Spjald 35

    Spurning

    Glutamine → three-letter code

    Svar

    Gln

  36. Spjald 36

    Spurning

    Tryptophan → one-letter code

    Svar

    W

  37. Spjald 37

    Spurning

    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. Spjald 38

    Spurning

    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. Spjald 39

    Spurning

    Glu → amino-acid name

    Svar

    Glutamate

  40. Spjald 40

    Spurning

    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. Spjald 41

    Spurning

    K → amino-acid name

    Svar

    Lysine

  42. Spjald 42

    Spurning

    Alanine → three-letter code

    Svar

    Ala

  43. Spjald 43

    Spurning

    Isoleucine → one-letter code

    Svar

    I

  44. Spjald 44

    Spurning

    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. Spjald 45

    Spurning

    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. Spjald 46

    Spurning

    Tyr → amino-acid name

    Svar

    Tyrosine

  47. Spjald 47

    Spurning

    R → amino-acid name

    Svar

    Arginine

  48. Spjald 48

    Spurning

    Proline → three-letter code

    Svar

    Pro

  49. Spjald 49

    Spurning

    Leucine → one-letter code

    Svar

    L

  50. Spjald 50

    Spurning

    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. Spjald 51

    Spurning

    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. Spjald 52

    Spurning

    Trp → amino-acid name

    Svar

    Tryptophan

  53. Spjald 53

    Spurning

    M → amino-acid name

    Svar

    Methionine

  54. Spjald 54

    Spurning

    Glycine → three-letter code

    Svar

    Gly

  55. Spjald 55

    Spurning

    Glutamate → one-letter code

    Svar

    E

  56. Spjald 56

    Spurning

    Histidine → three-letter code

    Svar

    His

  57. Spjald 57

    Spurning

    Valine → one-letter code

    Svar

    V

  58. Spjald 58

    Spurning

    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. Spjald 59

    Spurning

    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. Spjald 60

    Spurning

    Phe → amino-acid name

    Svar

    Phenylalanine

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

    120 spjöld

    Amino Acid Flashcards: 20 Side-Chain Structures & Codes

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  61. Spjald 61

    Spurning

    I → amino-acid name

    Svar

    Isoleucine

  62. Spjald 62

    Spurning

    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. Spjald 63

    Spurning

    Aspartate → one-letter code

    Svar

    D

  64. Spjald 64

    Spurning

    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. Spjald 65

    Spurning

    Arginine → three-letter code

    Svar

    Arg

  66. Spjald 66

    Spurning

    Pro → amino-acid name

    Svar

    Proline

  67. Spjald 67

    Spurning

    L → amino-acid name

    Svar

    Leucine

  68. Spjald 68

    Spurning

    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. Spjald 69

    Spurning

    Glutamine → one-letter code

    Svar

    Q

  70. Spjald 70

    Spurning

    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. Spjald 71

    Spurning

    Methionine → three-letter code

    Svar

    Met

  72. Spjald 72

    Spurning

    Gly → amino-acid name

    Svar

    Glycine

  73. Spjald 73

    Spurning

    E → amino-acid name

    Svar

    Glutamate

  74. Spjald 74

    Spurning

    His → amino-acid name

    Svar

    Histidine

  75. Spjald 75

    Spurning

    V → amino-acid name

    Svar

    Valine

  76. Spjald 76

    Spurning

    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. Spjald 77

    Spurning

    Asparagine → one-letter code

    Svar

    N

  78. Spjald 78

    Spurning

    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. Spjald 79

    Spurning

    Lysine → three-letter code

    Svar

    Lys

  80. Spjald 80

    Spurning

    Ala → amino-acid name

    Svar

    Alanine

  81. Spjald 81

    Spurning

    Proline → one-letter code

    Svar

    P

  82. Spjald 82

    Spurning

    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. Spjald 83

    Spurning

    Threonine → three-letter code

    Svar

    Thr

  84. Spjald 84

    Spurning

    Gln → amino-acid name

    Svar

    Glutamine

  85. Spjald 85

    Spurning

    W → amino-acid name

    Svar

    Tryptophan

  86. Spjald 86

    Spurning

    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. Spjald 87

    Spurning

    Glycine → one-letter code

    Svar

    G

  88. Spjald 88

    Spurning

    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. Spjald 89

    Spurning

    Histidine → one-letter code

    Svar

    H

  90. Spjald 90

    Spurning

    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. Spjald 91

    Spurning

    Serine → three-letter code

    Svar

    Ser

  92. Spjald 92

    Spurning

    Asn → amino-acid name

    Svar

    Asparagine

  93. Spjald 93

    Spurning

    F → amino-acid name

    Svar

    Phenylalanine

  94. Spjald 94

    Spurning

    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. Spjald 95

    Spurning

    Alanine → one-letter code

    Svar

    A

  96. Spjald 96

    Spurning

    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. Spjald 97

    Spurning

    Cysteine → three-letter code

    Svar

    Cys

  98. Spjald 98

    Spurning

    Asp → amino-acid name

    Svar

    Aspartate

  99. Spjald 99

    Spurning

    Y → amino-acid name

    Svar

    Tyrosine

  100. Spjald 100

    Spurning

    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. Spjald 101

    Spurning

    Ser → amino-acid name

    Svar

    Serine

  102. Spjald 102

    Spurning

    N → amino-acid name

    Svar

    Asparagine

  103. Spjald 103

    Spurning

    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. Spjald 104

    Spurning

    Lys → amino-acid name

    Svar

    Lysine

  105. Spjald 105

    Spurning

    A → amino-acid name

    Svar

    Alanine

  106. Spjald 106

    Spurning

    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. Spjald 107

    Spurning

    Cys → amino-acid name

    Svar

    Cysteine

  108. Spjald 108

    Spurning

    D → amino-acid name

    Svar

    Aspartate

  109. Spjald 109

    Spurning

    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. Spjald 110

    Spurning

    Arg → amino-acid name

    Svar

    Arginine

  111. Spjald 111

    Spurning

    P → amino-acid name

    Svar

    Proline

  112. Spjald 112

    Spurning

    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. Spjald 113

    Spurning

    Thr → amino-acid name

    Svar

    Threonine

  114. Spjald 114

    Spurning

    Q → amino-acid name

    Svar

    Glutamine

  115. Spjald 115

    Spurning

    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. Spjald 116

    Spurning

    Met → amino-acid name

    Svar

    Methionine

  117. Spjald 117

    Spurning

    G → amino-acid name

    Svar

    Glycine

  118. Spjald 118

    Spurning

    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. Spjald 119

    Spurning

    H → amino-acid name

    Svar

    Histidine

  120. Spjald 120

    Spurning

    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 spjöld

Amino Acid Flashcards: 20 Side-Chain Structures & Codes

Læra þennan stokk ókeypis

Nibomo opnast svo þú getir byrjað að læra.