The Presence of a Hydrophobic Amino Acid at Every Third $\alpha$

Multiple Choice

The presence of a hydrophobic amino acid at every third or fourth residue in $\alpha$ -keratin results in which of the following?

A) a random placement of hydrophobic amino acids within the helix
B) a strip of hydrophobic surface area that, when combined with another monomer, results in the formation of a dimer through hydrophobic interactions
C) a strip of hydrophobic surface area that causes individual $\alpha$ -keratin molecules to fold back on themselves through hydrophobic interactions
D) represents a deleterious mutation that causes the $\alpha$ -keratin molecules to aggregate and form plaques
E) none of the above