試題詳解

19. The first step of tRNA charging catalyzed by the aminoacyl-tRNA synthetase is:
(A) Reaction of the amino acid with ATP.
(B) Reaction of the amino acid with GTP.
(C) Transfer of the amino acid to the 3' end of tRNA.
(D) Transfer of the amino acid to the 5' end of tRNA.
(E) Binding of the amino acid to the anticodon loop.