Determine which of the following statements describes a tertiary structure of a protein.

For each of the conjugated proteins described, identify to which class of conjugated protein it belongs.

c. Phosphate groups are attached to this protein.

What level of protein structure is determined by the following:

a. Peptide bonds between amino acids?

What level of protein structure is determined by the following:

b. Hydrogen bonds between backbone carbonyl oxygen atoms and hydrogen atoms attached to backbone nitrogen atoms?

How do the following noncovalent 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.

a. Hydrophobic interactions

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

______ a) Hydrophobic R groups seeking a nonpolar environment move toward the inside of the folded protein.  

______ b) Protein chains of collagen form a polypeptide chain composed of 3 alpha helices. 

______ c) An active protein contains 4 tertiary subunits. 

______ d) Two polypeptide chains held together by disulfide bridges. 

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?