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Exam 19: Biomolecules: Amino Acids,peptides,and Proteins

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Question 21

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Consider the following structure.Based on this structure answer the following question(s). -Refer to instructions.Identify the C-terminal amino acid and the N-terminal amino acid.

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Question 22

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Which of the following reagents can be used to cleave a tert-butoxycarbonyl (Boc) protecting group from a peptide?

A) H₂/Pd
B) CF₃CO₂H
C) Na₂CO₃,H₂O
D) LiAlH₄

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Question 23

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

Draw the structure of the product of the following reaction and describe the usefulness of this type of reaction.

Write the equation for the reaction,using methanol (CH₃OH),that would render the carboxyl group of alanine unreactive.

Which of the following tripeptides is not hydrolysed by chymotrypsin?

Which of the following dipeptides is L-Ser-L-Phe?

Refer to the data below to answer the following question. -Refer to instructions.At what pH would you carry out an electrophoresis experiment if you wanted to separate a mixture of lysine,aspartic acid and phenylalanine? Explain.

How does phenyl isothiocyanate,Ph-N=C=S,react with a peptide in the Edman degradation?

To what structural feature does the term "secondary structure" refer?

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

Match a structure from the list below to each of the following terms. -

To what structural feature does the term "primary structure" refer?

Which of the following tripeptides is not hydrolysed by trypsin?

Refer to the data below to answer the following question(s). Porcine dynorphin is a neuropeptide having 17 amino acid residues.Its structure is shown below. Tyr-Gly-Gly-Phe-Leu-Arg-Arg-Ile-Arg-Pro-Lys-Leu-Lys-Trp-Asp-Asn-Gln -Refer to instructions.Show the steps involved in a synthesis of F-G-I using the Merrifield procedure.

Instructions: Match a term from the list below to each definition.