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Which of the following amino acids has a polar side chain?


A) isoleucine
B) valine
C) phenylalanine
D) threonine

E) B) and C)
F) All of the above

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MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid.


A) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
B) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
C) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
D) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
E) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
F) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
G) BOC group
H) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
I) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
J) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
K) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
L) MATCH a structure from the list below to each of the following terms. Place the letter of the structure in the blank to the left of the term which it describes. -_____ is a carboxyl-protected amino acid. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
M) Z group

N) E) and F)
O) A) and B)

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Which of the following amino acids is a secondary amine?


A) proline
B) glutamine
C) cysteine
D) aspargine

E) A) and C)
F) A) and B)

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Which of the following dipeptides is L-Ser-L-Phe? Which of the following dipeptides is L-Ser-L-Phe? A) 1 B) 2 C) 3 D) 4


A) 1
B) 2
C) 3
D) 4

E) All of the above
F) A) and B)

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Which of the following is a definition of the isoelectric point of an amino acid?


A) The pH at which an amino acid has no net charge
B) The pH at which the α\alpha -NH2 group is completely protonated
C) The melting point of an amino acid
D) The conductivity of a 1 M solution of an amino acid in water

E) All of the above
F) B) and C)

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Which of the following natural amino acids is an R-isomer?


A) cysteine
B) serine
C) valine
D) phenylalanine

E) B) and C)
F) C) and D)

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Valylalanine and alanylvaline are constitutional isomers.

A) True
B) False

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Which of the following amino acids has a basic side chain?


A) lysine
B) serine
C) leucine
D) tyrosine

E) A) and D)
F) C) and D)

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To what structural feature does the term "tertiary structure" refer?


A) the sequence of amino acids in proteins
B) the overall folding pattern of proteins
C) the aggregation of polypeptides
D) the conformation of local regions of polypeptides

E) A) and B)
F) A) and D)

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What is the isoelectric point of glutamic acid (pKa of α\alpha -CO2H, 2.10; pKa of β\beta -CO2H, 4.07; pH of α\alpha -NH2, 9.47) ?


A) 3.08
B) 5.67
C) 6.16
D) 17.28

E) A) and D)
F) A) and C)

Correct Answer

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