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Exam 15: Biomolecules: Amino Acids, Peptides, and Proteins

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Question 31

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Match a term from the list below to each definition. -Proteins which coil into compact shapes.

A) Ligases
B) Fibrous proteins
C) Conjugated protein
D) Hydrolases
E) Simple protein
F) Globular proteins
G) Kinases

H) F) and G)
I) D) and E)

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Question 32

Multiple Choice

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To what structural feature does the term "tertiary 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) A) and D)
F) All of the above

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Question 33

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Instructions: Refer to the data below to answer the following question. -Refer to inatructions. The most acidic amino acid is ____.

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

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

During peptide synthesis, the carboxylic acid group may be protected as the methyl ester. Aqueous base hydrolysis is utilized to remove the ester protecting group. Write the complete stepwise mechanism for the hydrolysis of the methyl ester of BOC-Val-Gly-OCH₃, above. Show all intermediate structures and all electron flow with arrows.

Define isoelectric point.

Match a term from the list below to each definition. -Enzymes which catalyze the bonding together of two substrates.

Which of the following tripeptides is not hydrolysed by trypsin?

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?