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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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False

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

Correct Answer

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


A) tyrosine
B) glutamine
C) aspargine
D) valine

E) All of the above
F) None of the above

Correct Answer

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Provide the structure of Ser-Phe-Asp.

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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) A) and B)

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

A) True
B) False

Correct Answer

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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?

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 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) 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. 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 polypeptide which gives four fragments on treatment with chymotrypsin. A) B) C) D) E) F) G) BOC group H) I) J) K) L) M) Z group
M) Z group

N) A) and H)
O) A) and I)

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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

Correct Answer

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

Correct Answer

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

Correct Answer

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Cys

Provide the major organic product of the following reaction that is used in the chemical synthesis of peptides. Provide the major organic product of the following reaction that is used in the chemical synthesis of peptides.

Correct Answer

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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

Correct Answer

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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.

Correct Answer

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11ea7d75_f648_c0ec_b9bd_c9c82e0274f5_TB1813_00_TB1813_00

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 (-).

Correct Answer

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What is the approximate value of the pKa of the Ξ±\alpha -NH3+ of amino acids?


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

E) All of the above
F) None of the above

Correct Answer

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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 D)
F) A) and C)

Correct Answer

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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

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

Correct Answer

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


A) lysine
B) aspartic acid
C) asparagine
D) glutamic acid

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

Correct Answer

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