試題詳解

29. Which of the following description of RNA processing events is correct?
(A) Cap is a modified 7-methylguanosine that 5'-3' links to the 5'terminus of RNA.
(B) RNA polyadenylation only happens in nucleus.
(C) RNA cap can be labeled with [B,y-32P]ATP but not with [y-32P]ΑΤΡ.
(D) RNA polymerase II transcription of a gene usually stops at the polyadenylation site.
(E) Once an mRNA loses its poly（A） tail, it is imported back into the nucleus for replenishing poly（A）tail.