α-Keratin Has All of the Following Characteristics EXCEPT

Multiple Choice

α-Keratin has all of the following characteristics EXCEPT:

A) primary component in hair, claws, fingernails, and horns of animals.
B) consists of four helical strands arranged as twisted pairs of two-stranded coiled coils.
C) has associated hydrophobic strips on the two coiled coils.
D) presence of properly placed polar amino acids help to solubilize α-keratin.
E) has covalent disulfide bonds to stabilize the structure.