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

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Question 1

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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

E) All of the above
F) B) and D)

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Question 2

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Which of the following dipeptides is L-Cys-L-Ala?

A)
B)
C)
D)

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

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Question 3

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Which amino acid results from the following sequence of transformations?

Consider the following structure.Based on this structure answer the following question(s). -Refer to instructions.Name the peptide using both the three-letter and one-letter codes.

Consider the following structure.Based on this structure answer the following question(s). -Refer to instructions.Circle the peptide bonds.

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

Define isoelectric point.

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.What fragments would result if dynorphin were cleaved by chymotropsin?

Draw and name the structure of the product of the following reaction. tryptophan

Which of the following amino acids has a sulfur-containing side chain?

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

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.What fragments would result if dynorphin were cleaved by trypsin?

Identify the aldehyde byproduct that results from the following reaction.

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

Which of the following amino acids would contain the highest concentration of zwitterions at pH 5.90?

Which of the following amino acids contains two stereocenters?

Instructions: Consider the following structure.Based on this structure answer the following question(s) . Refer to instructions.How many other peptides could be formed from this same combination of amino acids?

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

Which of the following amino acids is a secondary amine?

An enzyme classified as a ligase would be associated with a reaction than involves the: