Amino Acid Flashcards: 20 Side-Chain Structures & Codes

Question 1

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?

Accepted Answer

Histidine — side chain: Cα–CH₂–imidazolyl.

Question 2

Valine → three-letter code

Accepted Answer

Val

Question 3

Serine → one-letter code

Accepted Answer

S

Question 4

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

Which amino acid has this side chain?

Accepted Answer

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

Question 5

Phenylalanine → three-letter code

Accepted Answer

Phe

Question 6

Lysine → one-letter code

Accepted Answer

K

Question 7

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

Which amino acid has this side chain?

Accepted Answer

Alanine — side chain: Cα–CH₃.

Question 8

Isoleucine → three-letter code

Accepted Answer

Ile

Question 9

Cysteine → one-letter code

Accepted Answer

C

Question 10

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

Which amino acid has this side chain?

Accepted Answer

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

Question 11

Tyrosine → three-letter code

Accepted Answer

Tyr

Question 12

Arginine → one-letter code

Accepted Answer

R

Question 13

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

Which amino acid has this side chain?

Accepted Answer

Proline — side chain: Cα–(CH₂)₃–Nα.

Question 14

Leucine → three-letter code

Accepted Answer

Leu

Question 15

Threonine → one-letter code

Accepted Answer

T

Question 16

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

Which amino acid has this side chain?

Accepted Answer

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

Question 17

Tryptophan → three-letter code

Accepted Answer

Trp

Question 18

Methionine → one-letter code

Accepted Answer

M

Question 19

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

Which amino acid has this side chain?

Accepted Answer

Glycine — side chain: Cα–H.

Question 20

Glutamate → three-letter code

Accepted Answer

Glu

Question 21

Val → amino-acid name

Accepted Answer

Valine

Question 22

S → amino-acid name

Accepted Answer

Serine

Question 23

Asparagine → three-letter code

Accepted Answer

Asn

Question 24

Phenylalanine → one-letter code

Accepted Answer

F

Question 25

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

Which amino acid has this side chain?

Accepted Answer

Lysine — side chain: Cα–(CH₂)₄–NH₂.

Question 26

Alanine → draw or recall the side chain

Accepted Answer

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

Side chain: Cα–CH₃.

Question 27

Ile → amino-acid name

Accepted Answer

Isoleucine

Question 28

C → amino-acid name

Accepted Answer

Cysteine

Question 29

Aspartate → three-letter code

Accepted Answer

Asp

Question 30

Tyrosine → one-letter code

Accepted Answer

Y

Question 31

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

Which amino acid has this side chain?

Accepted Answer

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

Question 32

Proline → draw or recall the side chain

Accepted Answer

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

Side chain: Cα–(CH₂)₃–Nα.

Question 33

Leu → amino-acid name

Accepted Answer

Leucine

Question 34

T → amino-acid name

Accepted Answer

Threonine

Question 35

Glutamine → three-letter code

Accepted Answer

Gln

Question 36

Tryptophan → one-letter code

Accepted Answer

W

Question 37

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

Which amino acid has this side chain?

Accepted Answer

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

Question 38

Glycine → draw or recall the side chain

Accepted Answer

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

Side chain: Cα–H.

Question 39

Glu → amino-acid name

Accepted Answer

Glutamate

Question 40

Histidine → draw or recall the side chain

Accepted Answer

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.

Question 41

K → amino-acid name

Accepted Answer

Lysine

Question 42

Alanine → three-letter code

Accepted Answer

Ala

Question 43

Isoleucine → one-letter code

Accepted Answer

I

Question 44

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

Which amino acid has this side chain?

Accepted Answer

Cysteine — side chain: Cα–CH₂–SH.

Question 45

Aspartate → draw or recall the side chain

Accepted Answer

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

Side chain: Cα–CH₂–C(=O)–OH.

Question 46

Tyr → amino-acid name

Accepted Answer

Tyrosine

Question 47

R → amino-acid name

Accepted Answer

Arginine

Question 48

Proline → three-letter code

Accepted Answer

Pro

Question 49

Leucine → one-letter code

Accepted Answer

L

Question 50

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

Which amino acid has this side chain?

Accepted Answer

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

Question 51

Glutamine → draw or recall the side chain

Accepted Answer

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

Side chain: Cα–CH₂–CH₂–C(=O)–NH₂.

Question 52

Trp → amino-acid name

Accepted Answer

Tryptophan

Question 53

M → amino-acid name

Accepted Answer

Methionine

Question 54

Glycine → three-letter code

Accepted Answer

Gly

Question 55

Glutamate → one-letter code

Accepted Answer

E

Question 56

Histidine → three-letter code

Accepted Answer

His

Question 57

Valine → one-letter code

Accepted Answer

V

Question 58

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

Which amino acid has this side chain?

Accepted Answer

Serine — side chain: Cα–CH₂–OH.

Question 59

Asparagine → draw or recall the side chain

Accepted Answer

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

Side chain: Cα–CH₂–C(=O)–NH₂.

Question 60

Phe → amino-acid name

Accepted Answer

Phenylalanine

Question 61

I → amino-acid name

Accepted Answer

Isoleucine

Question 62

Cysteine → draw or recall the side chain

Accepted Answer

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

Side chain: Cα–CH₂–SH.

Question 63

Aspartate → one-letter code

Accepted Answer

D

Question 64

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?

Accepted Answer

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

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Amino Acid Flashcards: 20 Side-Chain Structures & Codes

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