Indicate whether each of the following statements describes primary, secondary, tertiary, or quaternary protein structure:
b. Protein chains of collagen form a triple helix.

How do the following interactions help to stabilize the tertiary and quaternary structure of a protein? Give an example of a pair of amino acids that could give rise to each interaction.

b. Disulfide bonds

A portion of a polypeptide chain contains the following sequence of amino acids:

—Leu—Val—Cys—Asp— 

a. Which amino acids are likely to be found on the inside of the protein structure? Why?

A portion of a polypeptide chain contains the following sequence of amino acids:

—Leu—Val—Cys—Asp—

c. How does the primary structure of a protein affect its tertiary structure?

Indicate whether each of the following statements describes primary, secondary, tertiary, or quaternary protein structure: 

c. Several polypeptides in a beta-pleated sheet are held together by hydrogen bonds between adjacent chains.

Indicate the changes in secondary and tertiary structural levels of proteins for each of the following:

b. Prior to giving an injection, the skin is wiped with an alcohol swab.

Indicate the changes in secondary and tertiary structural levels of proteins for each of the following:

c. To avoid spoilage, seeds are treated with a solution of HgCl₂.

Would you expect to find this segment at the center or at the surface of a protein? Why?

Consider the amino acids lysine, valine, and aspartate in an enzyme. State which of these amino acids have R groups that would:

b. be found in hydrophilic regions