試題詳解

33.Which of the following statements about tRNA is/are TRUE?
(A)The first and second bases of a codon in tRNA almost always form standard Watson-Crick base pairs with the third and second bases, respectively, of the corresponding anticodon.
(B)Four of the six codons for leucine (CUA, CUC, CUU, and UUA) are all recognized by the same tRNA with the anticodon 3'-GAI-5'.
(C)The G:U base pair can structurally fit almost as well as the standard G:C pair.
(D)Some 20-30 different tRNA have been identified in bacterial cells and as many as 30-40 in animal and plant cells.
(E)The un-folded structure of tRNA promotes its decoding functions.