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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.

Tämän pakan kortit

  1. Kortti 1

    Kysymys

    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?

    Vastaus

    Histidine — side chain: Cα–CH₂–imidazolyl.

  2. Kortti 2

    Kysymys

    Valine → three-letter code

    Vastaus

    Val

  3. Kortti 3

    Kysymys

    Serine → one-letter code

    Vastaus

    S

  4. Kortti 4

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  5. Kortti 5

    Kysymys

    Phenylalanine → three-letter code

    Vastaus

    Phe

  6. Kortti 6

    Kysymys

    Lysine → one-letter code

    Vastaus

    K

  7. Kortti 7

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

    Alanine — side chain: Cα–CH₃.

  8. Kortti 8

    Kysymys

    Isoleucine → three-letter code

    Vastaus

    Ile

  9. Kortti 9

    Kysymys

    Cysteine → one-letter code

    Vastaus

    C

  10. Kortti 10

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  11. Kortti 11

    Kysymys

    Tyrosine → three-letter code

    Vastaus

    Tyr

  12. Kortti 12

    Kysymys

    Arginine → one-letter code

    Vastaus

    R

  13. Kortti 13

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  14. Kortti 14

    Kysymys

    Leucine → three-letter code

    Vastaus

    Leu

  15. Kortti 15

    Kysymys

    Threonine → one-letter code

    Vastaus

    T

  16. Kortti 16

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  17. Kortti 17

    Kysymys

    Tryptophan → three-letter code

    Vastaus

    Trp

  18. Kortti 18

    Kysymys

    Methionine → one-letter code

    Vastaus

    M

  19. Kortti 19

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

    Glycine — side chain: Cα–H.

  20. Kortti 20

    Kysymys

    Glutamate → three-letter code

    Vastaus

    Glu

  21. Kortti 21

    Kysymys

    Val → amino-acid name

    Vastaus

    Valine

  22. Kortti 22

    Kysymys

    S → amino-acid name

    Vastaus

    Serine

  23. Kortti 23

    Kysymys

    Asparagine → three-letter code

    Vastaus

    Asn

  24. Kortti 24

    Kysymys

    Phenylalanine → one-letter code

    Vastaus

    F

  25. Kortti 25

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  26. Kortti 26

    Kysymys

    Alanine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₃.

  27. Kortti 27

    Kysymys

    Ile → amino-acid name

    Vastaus

    Isoleucine

  28. Kortti 28

    Kysymys

    C → amino-acid name

    Vastaus

    Cysteine

  29. Kortti 29

    Kysymys

    Aspartate → three-letter code

    Vastaus

    Asp

  30. Kortti 30

    Kysymys

    Tyrosine → one-letter code

    Vastaus

    Y

  31. Kortti 31

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  32. Kortti 32

    Kysymys

    Proline → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–(CH₂)₃–Nα.

  33. Kortti 33

    Kysymys

    Leu → amino-acid name

    Vastaus

    Leucine

  34. Kortti 34

    Kysymys

    T → amino-acid name

    Vastaus

    Threonine

  35. Kortti 35

    Kysymys

    Glutamine → three-letter code

    Vastaus

    Gln

  36. Kortti 36

    Kysymys

    Tryptophan → one-letter code

    Vastaus

    W

  37. Kortti 37

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  38. Kortti 38

    Kysymys

    Glycine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–H.

  39. Kortti 39

    Kysymys

    Glu → amino-acid name

    Vastaus

    Glutamate

  40. Kortti 40

    Kysymys

    Histidine → draw or recall the side chain

    Vastaus

    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. Kortti 41

    Kysymys

    K → amino-acid name

    Vastaus

    Lysine

  42. Kortti 42

    Kysymys

    Alanine → three-letter code

    Vastaus

    Ala

  43. Kortti 43

    Kysymys

    Isoleucine → one-letter code

    Vastaus

    I

  44. Kortti 44

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

    Cysteine — side chain: Cα–CH₂–SH.

  45. Kortti 45

    Kysymys

    Aspartate → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₂–C(=O)–OH.

  46. Kortti 46

    Kysymys

    Tyr → amino-acid name

    Vastaus

    Tyrosine

  47. Kortti 47

    Kysymys

    R → amino-acid name

    Vastaus

    Arginine

  48. Kortti 48

    Kysymys

    Proline → three-letter code

    Vastaus

    Pro

  49. Kortti 49

    Kysymys

    Leucine → one-letter code

    Vastaus

    L

  50. Kortti 50

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  51. Kortti 51

    Kysymys

    Glutamine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₂–CH₂–C(=O)–NH₂.

  52. Kortti 52

    Kysymys

    Trp → amino-acid name

    Vastaus

    Tryptophan

  53. Kortti 53

    Kysymys

    M → amino-acid name

    Vastaus

    Methionine

  54. Kortti 54

    Kysymys

    Glycine → three-letter code

    Vastaus

    Gly

  55. Kortti 55

    Kysymys

    Glutamate → one-letter code

    Vastaus

    E

  56. Kortti 56

    Kysymys

    Histidine → three-letter code

    Vastaus

    His

  57. Kortti 57

    Kysymys

    Valine → one-letter code

    Vastaus

    V

  58. Kortti 58

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

    Serine — side chain: Cα–CH₂–OH.

  59. Kortti 59

    Kysymys

    Asparagine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₂–C(=O)–NH₂.

  60. Kortti 60

    Kysymys

    Phe → amino-acid name

    Vastaus

    Phenylalanine

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

    120 korttia

    Amino Acid Flashcards: 20 Side-Chain Structures & Codes

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  61. Kortti 61

    Kysymys

    I → amino-acid name

    Vastaus

    Isoleucine

  62. Kortti 62

    Kysymys

    Cysteine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₂–SH.

  63. Kortti 63

    Kysymys

    Aspartate → one-letter code

    Vastaus

    D

  64. Kortti 64

    Kysymys

    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?

    Vastaus

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

  65. Kortti 65

    Kysymys

    Arginine → three-letter code

    Vastaus

    Arg

  66. Kortti 66

    Kysymys

    Pro → amino-acid name

    Vastaus

    Proline

  67. Kortti 67

    Kysymys

    L → amino-acid name

    Vastaus

    Leucine

  68. Kortti 68

    Kysymys

    Threonine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH(OH)–CH₃.

  69. Kortti 69

    Kysymys

    Glutamine → one-letter code

    Vastaus

    Q

  70. Kortti 70

    Kysymys

    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?

    Vastaus

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

  71. Kortti 71

    Kysymys

    Methionine → three-letter code

    Vastaus

    Met

  72. Kortti 72

    Kysymys

    Gly → amino-acid name

    Vastaus

    Glycine

  73. Kortti 73

    Kysymys

    E → amino-acid name

    Vastaus

    Glutamate

  74. Kortti 74

    Kysymys

    His → amino-acid name

    Vastaus

    Histidine

  75. Kortti 75

    Kysymys

    V → amino-acid name

    Vastaus

    Valine

  76. Kortti 76

    Kysymys

    Serine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₂–OH.

  77. Kortti 77

    Kysymys

    Asparagine → one-letter code

    Vastaus

    N

  78. Kortti 78

    Kysymys

    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?

    Vastaus

    Phenylalanine — side chain: Cα–CH₂–C₆H₅.

  79. Kortti 79

    Kysymys

    Lysine → three-letter code

    Vastaus

    Lys

  80. Kortti 80

    Kysymys

    Ala → amino-acid name

    Vastaus

    Alanine

  81. Kortti 81

    Kysymys

    Proline → one-letter code

    Vastaus

    P

  82. Kortti 82

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  83. Kortti 83

    Kysymys

    Threonine → three-letter code

    Vastaus

    Thr

  84. Kortti 84

    Kysymys

    Gln → amino-acid name

    Vastaus

    Glutamine

  85. Kortti 85

    Kysymys

    W → amino-acid name

    Vastaus

    Tryptophan

  86. Kortti 86

    Kysymys

    Methionine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₂–CH₂–S–CH₃.

  87. Kortti 87

    Kysymys

    Glycine → one-letter code

    Vastaus

    G

  88. Kortti 88

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

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

  89. Kortti 89

    Kysymys

    Histidine → one-letter code

    Vastaus

    H

  90. Kortti 90

    Kysymys

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

    Which amino acid has this side chain?

    Vastaus

    Valine — side chain: Cα–CH(CH₃)₂.

  91. Kortti 91

    Kysymys

    Serine → three-letter code

    Vastaus

    Ser

  92. Kortti 92

    Kysymys

    Asn → amino-acid name

    Vastaus

    Asparagine

  93. Kortti 93

    Kysymys

    F → amino-acid name

    Vastaus

    Phenylalanine

  94. Kortti 94

    Kysymys

    Lysine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–(CH₂)₄–NH₂.

  95. Kortti 95

    Kysymys

    Alanine → one-letter code

    Vastaus

    A

  96. Kortti 96

    Kysymys

    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?

    Vastaus

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

  97. Kortti 97

    Kysymys

    Cysteine → three-letter code

    Vastaus

    Cys

  98. Kortti 98

    Kysymys

    Asp → amino-acid name

    Vastaus

    Aspartate

  99. Kortti 99

    Kysymys

    Y → amino-acid name

    Vastaus

    Tyrosine

  100. Kortti 100

    Kysymys

    Arginine → draw or recall the side chain

    Vastaus

    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. Kortti 101

    Kysymys

    Ser → amino-acid name

    Vastaus

    Serine

  102. Kortti 102

    Kysymys

    N → amino-acid name

    Vastaus

    Asparagine

  103. Kortti 103

    Kysymys

    Phenylalanine → draw or recall the side chain

    Vastaus

    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. Kortti 104

    Kysymys

    Lys → amino-acid name

    Vastaus

    Lysine

  105. Kortti 105

    Kysymys

    A → amino-acid name

    Vastaus

    Alanine

  106. Kortti 106

    Kysymys

    Isoleucine → draw or recall the side chain

    Vastaus

    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. Kortti 107

    Kysymys

    Cys → amino-acid name

    Vastaus

    Cysteine

  108. Kortti 108

    Kysymys

    D → amino-acid name

    Vastaus

    Aspartate

  109. Kortti 109

    Kysymys

    Tyrosine → draw or recall the side chain

    Vastaus

    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. Kortti 110

    Kysymys

    Arg → amino-acid name

    Vastaus

    Arginine

  111. Kortti 111

    Kysymys

    P → amino-acid name

    Vastaus

    Proline

  112. Kortti 112

    Kysymys

    Leucine → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₂–CH(CH₃)₂.

  113. Kortti 113

    Kysymys

    Thr → amino-acid name

    Vastaus

    Threonine

  114. Kortti 114

    Kysymys

    Q → amino-acid name

    Vastaus

    Glutamine

  115. Kortti 115

    Kysymys

    Tryptophan → draw or recall the side chain

    Vastaus

    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. Kortti 116

    Kysymys

    Met → amino-acid name

    Vastaus

    Methionine

  117. Kortti 117

    Kysymys

    G → amino-acid name

    Vastaus

    Glycine

  118. Kortti 118

    Kysymys

    Glutamate → draw or recall the side chain

    Vastaus

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

    Side chain: Cα–CH₂–CH₂–C(=O)–OH.

  119. Kortti 119

    Kysymys

    H → amino-acid name

    Vastaus

    Histidine

  120. Kortti 120

    Kysymys

    Valine → draw or recall the side chain

    Vastaus

    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 korttia

Amino Acid Flashcards: 20 Side-Chain Structures & Codes

Opiskele tätä pakkaa ilmaiseksi

Nibomo avautuu, jotta voit aloittaa opiskelun.