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

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Question 1

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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.

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Ser-Phe-Gly S-F-G

Question 2

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Which of the following amino acids is a secondary amine?

A) proline
B) glutamine
C) histidine
D) aspargine

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

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Question 3

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

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

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

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

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

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

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?

Which amino acid results from the following sequence of transformations?

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

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

What are the R/S designations of the two stereocenters of L-threonine?

Which of the following amino acids contains two stereocenters?

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

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?

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

Define isoelectric point.

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?

Identify the aldehyde byproduct that results from the following reaction.