試題詳解

2. Please choose the answer from the following descriptions:
1. a-Keratin is a protein which provides strength in connective tissue.
2. Disulfide linkages are important for keratin structure.
3. Gly residues are particularly abundant in collagen.
4. L-isoleucine is an diastereomer of D-leucine.
5. a-Keratin is a protein in which the polypeptides are mainly in the a-helix conformation.
(A) 1 and 4 are incorrect.
(B) 1 and 5 are incorrect.
(C) 1, 2, and 3 are correct.
(D) 3 and 4 are correct.

(E) Only 2 and 5 are correct