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Chapter 3 Amino Acids, Peptides, and Proteins

Multiple Choice Questions

1.    Amino acids

Page: 76 Difficulty: 1 Ans: C

Tlie chirality of an amino aad results from the fect that lts a carbon

A)    has no net charge

B)    isa carboxyhcaad

C)    is bonded to four different Chemical groups

D)    is m the l absolute configuration m naturally ocaunng proteins

E)    is symmetnc

2.    Amino acids

Page: 76 Difficulty: 2 Ans: B

Of the 20 standard amino aads, only_is not optically active The reason is that lts side

cham    .

A)    alaninę, is a simple methyi group

B)    glyane, is a hydrogen atom

C)    glyane, is unbranched

D)    łysinę, contams only nitro gen

E)    proline, forms a covalent bond with the amino group

3.    Amino acids

Page: 79 Difficulty: 1 Ans: C

Two amino aads of the standard 20 contam sulfur atoms Tliey are

Ali of the amino aads that are found m proteins, except for proline, contam a(n):

A)    amino group

B)    caibonyl group

C)    carboxyl group

D)    ester group

E)    thiol group

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