The signal for the addition of a poly-A tail to pre-mRNA is
A) UUUUUUU.
B) TTTTTTTT.
C) AAUAAA.
D) GCGCUGC.

Question

Quizplus · Accepted Answer

The signal for the addition of a poly-A tail is the AAUAAA sequence, also known as the polyadenylation signal. This signal is recognized by specific proteins that cleave the pre-mRNA and add the poly-A tail. Therefore, choice C is the correct answer. The other choices (A, B, and D) are not known as signals for poly-A tail addition.

The Signal for the Addition of a Poly-A Tail to Pre-MRNA