Question 16.CC.7: Structures of Proteins Indicate which of the following are p......
Structures of Proteins
Indicate which of the following are present in the primary, secondary, tertiary, and quaternary structures of proteins:
a. peptide bonds
b. hydrogen bonds between adjacent peptides
c. hydrogen bonds within a single peptide
d. hydrophobic interactions
e. association of four polypeptide chains
a. Peptide bonds are present at all levels of protein structures.
b. Hydrogen bonds between adjacent peptides occur in the secondary structures such as β-pleated sheets, triple helices, and in quaternary structures.
c. Hydrogen bonds within a single peptide is a characteristic of the secondary structure of an α helix as well as in tertiary structures.
d. Hydrophobic interactions between two nonpolar R groups occur in the tertiary and quaternary structures of proteins.
e. The association of four polypeptide chains occurs in the quaternary structures of proteins.