Which of the following is true at the time introns are spliced out of mRNA?
A) Neither end of the mRNA has been processed.
B) Both ends of the mRNA have been processed.
C) Only the 3' end of mRNA has been processed.
D) Only the 5' end of the mRNA is has been processed.

Question

Quizplus · Accepted Answer

Both ends of the mRNA have been processed by the time introns are spliced out. This means that the 5' end has a modified guanine nucleotide cap added, and the 3' end has a poly-A tail added through a process called cleavage and polyadenylation. This processing occurs before splicing takes place to ensure that the mRNA is stable and can be efficiently transported out of the nucleus.

Which of the Following Is True at the Time Introns