Indicate whether each of the following statements describes primary, secondary, tertiary, or quaternary protein structure: $R$ groups interact to form disulfide bonds or salt bridges.

A portion of a polypeptide chain contains the following sequence of amino acids: –Leu–Val–Cys–Asp–

a. Which amino acid can form a disulfide bond?

What type of interaction would you expect between the following groups in a tertiary structure?

d. alanine and proline

What type of interaction would you expect between the following groups in a tertiary structure?

c. asparagine and tyrosine

What type of interaction would you expect between the following groups in a tertiary structure?

b. aspartate and histidine

What type of interaction would you expect between the following groups in a tertiary structure?

a. phenylalanine and isoleucine

What type of interaction would you expect between the following groups in a tertiary structure?

d. leucine and leucine

What type of interaction would you expect between the following groups in a tertiary structure?

c. serine and aspartate

What type of interaction would you expect between the following groups in a tertiary structure?

b. glutamate and lysine

What type of interaction would you expect between the following groups in a tertiary structure?

a. cysteine and cysteine

In an a helix, how does bonding occur between the amino acids in the polypeptide chain?

What is the difference in hydrogen bonding between an $\alpha$ helix and a $\beta$-pleated sheet?

What are two types of secondary protein structure?

Classify each of the following proteins according to its function:

d. amylases that catalyze the hydrolysis of starch