試題詳解

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

(1) All amino acids in nature are L-amino acids.

(2) The pl value of the peptide "GAILLSDN" is lower than that of the peptide "VPRYTTN".

(3) Paralogous genes are presumed to have been derived by gene duplication followed by gradual changes in the sequences of both copies.

(4) Collagen is full of a-helix structure and has Gly-X-Pro repeating sequence.

(5) Trypsin could hydrolyze the "X-K" peptide bond.
(A) 1, 3, and 5 are correct.
(B) 2 and 5 are correct.
(C) 3, 4, and 5 are correct.
(D) Only 3 is correct.
(E) 1, 4, and 5 are incorrect.