試題詳解

26. Please choose the     correct     answer from the following descriptions:

(1) The non-amino acid part of a conjugated protein is called its prosthetic group.

(2) a-keratin is a protein in which the polypeptides are mainly in the a-helix conformation.

(3) Arg side-chain is an imidazole group and has important role in maintaining pH in blood.

(4) Every turn of a-helix is 10 A in length.

(5) Phenylisothiocyanate could only be used to determine the first amino acid of a protein.
(A) 1 and 2 are correct.
(B) 1, 4, and 5 are incorrect.
(C) 1, 3, and 5 are incorrect.
(D) 2 and 5 are correct.
(E) 3 and 4 are correct.