Question

this protein can exist as a dimer of right handed helices in a coiled coil offset by an 18 degree inclination. neighboring subunits within the hierarchical structure form disulfide bonds when two sulfhydryl groups on cysteines are oxidized.

(A) collagen

(B) hemoglobin

(C) alpha-keratin

(D) beta-keratin

(E) actin

Answer 1

Answers (C )alpha keratine

Alpha keratine is a polypeptide chain,typically high in alkaline,leucine arginine and cysteine that forms a right handed alpha helix.

Two of these polypeptide chains twisted together to form a left handed helical structure called a coiled coil.these coiled coil dimmers approximately 45nm long,are bonded together with disulfide bonds utilising the many cysteine amino acids found in alpha keratine.