試題詳解

17. Which of the following statements on eukaryotic mRNA is NOT true?
(A) mRNA is usually capped at the 5' terminus.
(B) mRNA always contains a poly-A tail.
(C) Translation usually starts from the first AUG codon from the 5' terminus.
(D) mRNA often contains an AAUAAA sequence in the 3' region as a polyadenylation signal.
(E) mRNA does not contain a Shine-Dalgarno sequence for translation initiation.