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

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.

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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 D)
F) None of the above

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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-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 D)

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The following structure is that of Sanger's reagent. The following structure is that of Sanger's reagent.

A) True
B) False

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Which of the following amino acids has a sulfhydryl group?


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

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

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

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What are the R/S designations of the two stereocenters of L-threonine? What are the R/S designations of the two stereocenters of L-threonine? 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) A) 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) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu D) E) F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val G) BOC group H) I) J) K) L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe 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) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu D) E) F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val G) BOC group H) I) J) K) L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe M) Z group
C) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu
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) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu D) E) F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val G) BOC group H) I) J) K) L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe 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) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu D) E) F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val G) BOC group H) I) J) K) L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe M) Z group
F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val
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) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu D) E) F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val G) BOC group H) I) J) K) L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe 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) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu D) E) F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val G) BOC group H) I) J) K) L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe 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) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu D) E) F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val G) BOC group H) I) J) K) L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe 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) Val−Phe−Leu−Met−Tyr−Pro−Gly−Trp−Cys−Glu D) E) F) Asp−Tyr−Ile−His−Pro−Phe−Arg−Val G) BOC group H) I) J) K) L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe M) Z group
L) Val−Lys−Phe−Gly−Arg−Met−Arg−Phe
M) Z group

N) F) and H)
O) A) and D)

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What is the approximate value of the pKa of the α-NH3+ of amino acids?


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

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

Correct Answer

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

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The structure of the phenylhydantoin derived from the _____ cycle of the Edman degradation of Phe-Ala-Ser is The structure of the phenylhydantoin derived from the _____ cycle of the Edman degradation of Phe-Ala-Ser is

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Which of the following is not a strategy for the synthesis of polypeptides?


A) Protect the a-amino group of the amino acid aa1 to reduce its nucleophilicity so that the group does not participate in nucleophilic addition to the carboxyl group of either aa1 or aa2.
B) Cleave the polypeptide at specific peptide bonds, determine the sequence of each fragment, and then match overlapping fragments to arrive at the sequence of the polypeptide.
C) Activate the a-carboxyl group of the amino acid aa1 so that the group is susceptible to nucleophilic attack by the a-amino group of aa2.
D) Protect the a-carboxyl group of the amino acid aa2 so that the amino acid is not susceptible to nucleophilic attack by the a-amino group of another molecule of aa2.

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

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Consider the following image. Consider the following image. This represents the tertiary structure of a protein. This represents the tertiary structure of a protein.

A) True
B) False

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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 B)
F) All of the above

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Identify the function of the following group in protein synthesis. ​ Identify the function of the following group in protein synthesis. ​ A) Protection B) Hydrolysis C) Hydrogenation D) Alkylation


A) Protection
B) Hydrolysis
C) Hydrogenation
D) Alkylation

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

Correct Answer

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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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