The Peptide Hormone Insulin Is Composed of Two Peptide Held

Multiple Choice

The peptide hormone insulin is composed of two peptide held together primarily by what mechanism?

A) disulfide bonds between cysteine residues
B) charge-charge interactions between acidic and basic amino acids
C) extensive hydrogen bonding due to the relatively high serine and glutamine content
D) hydrophobic interactions
E) an amide bond formed from the R-groups of a glutamic acid residue and a lysine residue