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Exam 24: Amino Acids, Peptides, and Proteins

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Question 21

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What is the major force responsible for the formation of an α-helix in protein secondary structure?

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Question 22

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An amino acid analyzer can be used to determine:

A) the sequence of amino acids in a peptide.
B) the identity of the amino acids present in a peptide.
C) the relative amounts of the amino acids present in a peptide.
D) both A and C
E) both B and C

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

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Question 23

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Which of the following amino acids has an isoelectric pH of 3.2?

Which of the following will result in removal of a benzyl ester protecting group?

What is the net charge of arginine in a solution of pH 10.0?

Which of the following terms best describes the side chain of valine?

Provide a structure of the dipeptide Val-Lys-Glu at biological pH.

Draw the dipeptide Val-Tyr.

Provide the structure of Thr-Gln-Met.

Which of the following fragments would not result when the decapeptide Asn-Gly-Lys-Phe-Pro-Arg-Gly-Leu-Lys-Ser is treated with trypsin?

Show where trypsin would cleave the peptide shown below.

Give a detailed, stepwise mechanism for the formation of the activated acyl derivative from the reaction of an amino acid with N,N'-dicyclohexylcarbodiimide.

Draw the form of L-lysine which is present at biological pH.

Treatment of a peptide which contains disulfide linkages with peroxyformic acid yields a peptide which contains what new amino acid residue?

In an electrophoresis carried out at pH 9.0, does phenylalanine migrate toward the cathode, migrate toward the anode, or not migrate at all? Explain briefly.

Provide the Fischer projection of L-aspartic acid.

Draw the structure of the tetrapeptide Ser-Leu-Phe-Pro.

Addition of alanine to distilled water will produce:

Proteins which provide all the essential amino acids in about the right proportions are called:

How can an α-ketoacid be converted to an α-aminoacid?