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Bradykinin is a nonapeptide, Arg-Pro-Pro-Gly-Phe-Ser-Pro-Phe-Arg. In addition to one mole of Arg, the following peptides are present after hydrolysis of bradykinin with chymotrypsin, Arg-Pro-Pro-Gly-Phe-Ser and Pro-Phe

A) True
B) False

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Ninhydrin is used to determine the N-terminal amino acid of a peptide.

A) True
B) False

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Which of the following tripeptides is not hydrolyzed by chymotrypsin?


A) Phe-Lys-Glu
B) Lys-Tyr-Phe
C) Gln-Ser-Phe
D) Gln-Tyr-Ser

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

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Edman degradation of the peptide saralasin shows that it has a sarcosine residue at the N-terminus. Sarcosine is Edman degradation of the peptide saralasin shows that it has a sarcosine residue at the N-terminus. Sarcosine is Partial hydrolysis of saralasin with dilute hydrochloric acid gives the following fragments: What is the structure of saralasin? Partial hydrolysis of saralasin with dilute hydrochloric acid gives the following fragments: Edman degradation of the peptide saralasin shows that it has a sarcosine residue at the N-terminus. Sarcosine is Partial hydrolysis of saralasin with dilute hydrochloric acid gives the following fragments: What is the structure of saralasin? What is the structure of saralasin?

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What is the approximate value of the pKa of the Ξ±\alpha -CO2H of amino acids?


A) 2
B) 5
C) 9
D) 12

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

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Consider the following octapeptide. Ala-Val-Trp-Lys-Phe-Gly-Arg-Met The fragments that would be obtained by a trypsin hydrolysis are Ala-Val-Trp-Lys and Phe-Gly-Arg and Met.

A) True
B) False

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Structure _____ (shown below) will remain at the origin in an electrophoresis experiment. Structure _____ (shown below) will remain at the origin in an electrophoresis experiment.

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The molecule shown below is an Ξ±\alpha -amino acid. The molecule shown below is an \alpha -amino acid.

A) True
B) False

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Which of the bonds in the following structure is cleaved by cyanogen bromide? Which of the bonds in the following structure is cleaved by cyanogen bromide? A) i B) ii C) iii D) iv


A) i
B) ii
C) iii
D) iv

E) C) and D)
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 a peptide coupling reagent.


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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. 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 peptide coupling reagent. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
M) Z group

N) B) and C)
O) D) and L)

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How does phenyl isothiocyanate, Ph-N=C=S, react with a peptide in the Edman degradation?


A) the sp carbon acts as an electrophile in a reaction with an amino group of the peptide
B) the sulfur acts as a nucleophile and adds to the carbon of the peptide bond
C) the nitrogen acts as a nucleophile and adds to the carbon of the peptide bond
D) the sp carbon acts as an electrophile in a reaction with a carboxylate of the peptide

E) None of the above
F) B) and D)

Correct Answer

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To what structural feature does the term "quaternary 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) None of the above
F) A) and B)

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In terms of the number of amino acid residues Cys-Ile-Ser-Asp-Gly-His-Gly-Gly would be classified as a(n) ________________.

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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 the product of an Edman degradation.


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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. 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 the product of an Edman degradation. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
M) Z group

N) F) and K)
O) C) and K)

Correct Answer

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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 amino acid in its zwitterionic form.


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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
M) Z group

N) C) and H)
O) C) and F)

Correct Answer

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What are the R/S designations of the two stereocenters of isoleucine? What are the R/S designations of the two stereocenters of isoleucine? A) 2R,3R B) 2R,3S C) 2S,3R D) 2S,3S


A) 2R,3R
B) 2R,3S
C) 2S,3R
D) 2S,3S

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

Correct Answer

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


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

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

Correct Answer

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To what structural feature does the term "primary 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 C)
F) B) and D)

Correct Answer

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Provide the structure of Ser-Ala.

Correct Answer

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Which of the following amino acids has an acidic side chain?


A) glutamine
B) glycine
C) glutamic acid
D) threonine

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

Correct Answer

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