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

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Provide the structure of Ser-Phe-Asp.

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What fragments are produced when porcine dynorphin, a peptide that contains 17 amino acid residues (shown below), is cleaved with chymotropsin? Tyr−Gly−Gly−Phe−Leu−Arg−Arg−Ile−Arg−Pro−Lys−Leu−Lys−Trp−Asp−Asn−Gln

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Tyr
Gly−Gly−Phe
Leu−...

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


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

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

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

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


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

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

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Which of the following is not a polypeptide?


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

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

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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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What fragments are produced when porcine dynorphin, a peptide that contains 17 amino acid residues (shown below), is cleaved with trypsin? Tyr−Gly−Gly−Phe−Leu−Arg−Arg−Ile−Arg−Pro−Lys−Leu−Lys−Trp−Asp−Asn−Gln

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Tyr−Gly−Gly−Phe−Leu−...

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In Cys-Ile-Ser-Asp-Gly-His-Gly-Gly, the three-letter abbreviation for the N-terminal amino acid is ________.

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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) 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 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) 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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 amino acid in its zwitterionic form. 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) D) and I)
O) H) and I)

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Provide the structure of dicylcohexylcarbodiimide, a common reagent that is used to couple two amino acid residues by formation of a peptide bond, and the structure N,N'-dicyclohexylurea, the byproduct of this reaction.

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What is the approximate value of the pKa of the α-CO2H of amino acids?


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

E) A) and B)
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 polypeptide which gives four fragments on treatment with chymotrypsin.


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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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) None of the above
O) A) and M)

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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: His−Pro−Ala Val−Tyr−Val Arg−Val−Tyr Sar−Arg−Val Tyr−Val−His What is the structure of saralasin? Partial hydrolysis of saralasin with dilute hydrochloric acid gives the following fragments: His−Pro−Ala Val−Tyr−Val Arg−Val−Tyr Sar−Arg−Val Tyr−Val−His What is the structure of saralasin?

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Sar−Arg−Va...

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Disulfide bonds form between the thiol side chains of cysteine. What is the best term to describe the reaction of two thiols to give a disulfide bond?

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Structure _____ (shown below) will remain at the origin in an electrophoresis experiment. CH3CHCO2−CH3CHCO2−CH3CHCO2H∣∣∣+NH3NH2+NH3IIIIII\begin{array}{ccc}\mathrm{CH}_{3} \mathrm{CHCO}_{2}^{-} & \mathrm{CH}_{3} \mathrm{CHCO}_{2}^{-} &\mathrm{CH}_{3} \mathrm{CHCO}_{2} \mathrm{H}\\|&|&|\\{ }^{+} \mathrm{NH}_{3} & \mathrm{NH}_{2} &{ }^{+} \mathrm{NH}_{3}\\I&II&III\end{array}

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