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Which of the following amino acids is not an L-isomer?


A) serine
B) valine
C) glycine
D) proline

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

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Which of the following reagents can be used to cleave a benzyloxycarbonyl protecting group from a peptide?


A) H2/Pd
B) H2O
C) Na2CO3, H2O
D) LiAlH4

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

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


A) histidine
B) arginine
C) glutamine
D) valine

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

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The Edman degradation is used to identify the ___-terminal amino acid of a peptide.

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The number of different combinations that are possible for a tripeptide containing one of each of the following amino acids: Phe, Val, Asp is ______.

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Which of the following amino acids contains two stereocenters?


A) isoleucine
B) proline
C) phenylalanine
D) glutamine

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

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Structure _____ (shown below) will migrate toward the positive electrode in an electrophoresis experiment. Structure _____ (shown below) will migrate toward the positive electrode in an electrophoresis experiment.

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What are the products of the reaction of alanine and ninhydrin (shown below)? What are the products of the reaction of alanine and ninhydrin (shown below)?

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Which of the following amino acids migrates to the positive electrode on paper electrophoresis at a pH of 7.0?


A) glutamic acid
B) arginine
C) lysine
D) histadine

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

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Hydrogen bonds, α\alpha -helices, and pleated sheets are properties of structure of proteins.

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What is the major organic product of the following reaction? What is the major organic product of the following reaction? A) 1 B) 2 C) 3 D) 4


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

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

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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 an octapeptide with a C-terminal valine.


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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
M) Z group

N) E) and G)
O) B) and M)

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Consider the following form of phenylalanine. Consider the following form of phenylalanine. This form would exist at a pH _______than the pI. This form would exist at a pH _______than the pI.

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What fragments are produced when porcine dynorphin, a peptide that contains 17 amino acid residues (shown below), is cleaved with trypsin? What fragments are produced when porcine dynorphin, a peptide that contains 17 amino acid residues (shown below), is cleaved with trypsin?

Correct Answer

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Which of the following is not a polypeptide?


A) L-HIV-1 protease
B) hemoglobin
C) myoglobin
D) glycogen

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

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In Phe-Ile-Ser-Asp-Gly-His-Gly-Tyr, the three-letter abbreviation for the C-terminal amino acid is ________.

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What is the isoelectric point of serine (pKa of α\alpha -CO2H, 2.21; pKa of α\alpha -NH2, 9.15) ?


A) 5.68
B) 9.94
C) 11.36
D) 20.22

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

Correct Answer

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Which of the following amino acids is not chiral?


A) leucine
B) glycine
C) alanine
D) proline

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

Correct Answer

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In the Edman degradation analysis of the N-terminus of a peptide the terminal residue reacts with phenyl isocyanate, an example is shown below. Provide the structure of both of the products of this reaction. In the Edman degradation analysis of the N-terminus of a peptide the terminal residue reacts with phenyl isocyanate, an example is shown below. Provide the structure of both of the products of this reaction.

Correct Answer

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Which of the following tripeptides is not hydrolyzed by trypsin?


A) Glu-Arg-Ser
B) Arg-Glu-Thr
C) Glu-Ser-Arg
D) Lys-Ser-Arg

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

Correct Answer

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