The 20 Amino Acids (Chem 364 - Biochemistry)

Question 1

glycine (Gly)

Answer 1

nonpolar, R = H

Question 2

alanine (Ala)

Answer 2

nonpolar, R = CH3

Question 3

valine (Val)

Answer 3

nonpolar, R = CH(CH3)2

Question 4

leucine (Leu)

Answer 4

nonpolar, R = CH2-CH(CH3)2

Question 5

isoleucine (Ile)

Answer 5

nonpolar, R = CH(CH3)CH2-CH3

Question 6

serine (Ser)

Answer 6

uncharged polar, R = CH2-OH

Question 7

threonine (Thr)

Answer 7

uncharged polar, R = CH(CH3)OH

Question 8

cysteine (Cys)

Answer 8

uncharged polar, R = CH2-SH

Question 9

methionine (Met)

Answer 9

nonpolar, R = CH2-CH2-S-CH3

Question 10

proline (Pro)

Answer 10

nonpolar, R = CH2-CH2-CH2 (ring connected to alpha-carbon and amino group, to form a five membered ring)

Question 11

phenylalanine (Phe)

Answer 11

nonpolar, R = CH2-Phenyl

Question 12

tyrosine (Tyr)

Answer 12

uncharged polar, R = CH2-Phenyl-OH

Question 13

tryptophan (Trn)

Answer 13

nonpolar, R = CH2-Indole

Question 14

aspartate (Asp)

Answer 14

charged polar, R = CH2-COO-

Question 15

glutamate (Glu)

Answer 15

charged polar, R = CH2-CH2-COO-

Question 16

asparagine (Asn)

Answer 16

uncharged polar, R = CH2-C(NH2)=O

Question 17

glutamine (Gln)

Answer 17

uncharged polar, R = CH2-CH2-C(NH2)=O

Question 18

lysine (Lys)

Answer 18

charged polar, R = CH2-CH2-CH2-CH2-NH3+

Question 19

arginine (Arg)

Answer 19

charged polar, R = CH2-CH2-CH2-NH-C(NH2)=NH2+

Question 20

histidine (His)

Answer 20

uncharged polar, R = CH2-imidazole