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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) 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 an octapeptide with a C-terminal valine. 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 K)
O) B) and M)

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

A) True
B) False

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A tetrapeptide contains the amino acids Phe, Ala, Gly, and Leu. Partial hydrolysis produces the dipeptides Phe-Ala, Ala-Gly, and Leu-Phe. The structure of the tetrapeptide is _________________________. Use the three-letter designations for the amino acids separated by dashes (-).

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


A) HBr, CH3CO2H
B) conc. NaOH
C) heat
D) NaCl, H2O

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

Correct Answer

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


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

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

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In the case of paper electrophoresis, a paper strip saturated with an aqueous buffer of predetermined pH serves as a bridge between the two _____.

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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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Which of the following is not an endopeptidase?


A) Trypsin
B) Chymotrypsin
C) Elastase
D) Carboxypeptidase A

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

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Identify the technique that has almost replaced the automated Edman degradation.


A) Gas chromatography
B) Infrared spectroscopy
C) Mass spectroscopy
D) N-terminal Amino acid analysis

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

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

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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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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) C) and D)

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For leucine the pI is the average of pKa1 and pKa2.

A) True
B) False

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

Correct Answer

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To what structural feature does the term "secondary 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) All of the above

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Identify the compound shown below. ​ Identify the compound shown below. ​ A) L-Thyroxine B) L-Triiodothyronine C) L-Omithine D) L-Citrulline


A) L-Thyroxine
B) L-Triiodothyronine
C) L-Omithine
D) L-Citrulline

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

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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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