Suppose that an induced mutation removes most of the 5' end of the 5' UTR of an mRNA. What is most likely to happen?
A) Removal of the 5' UTR will have no effect because the exons are still maintained.
B) Removal of the 5' UTR also removes the 5' cap and the mRNA will quickly degrade.
C) The 3' UTR will duplicate and one copy will replace the 5' end.
D) The first exon will not be read because I1 will now serve as the UTR.

Question

Quizplus · Accepted Answer

The 5' UTR is necessary for the 5' cap to be added to the mRNA, which protects it from degradation by exonucleases. Without the cap, the mRNA is likely to be quickly degraded. The remaining answer choices are not likely outcomes of this mutation.

Suppose That an Induced Mutation Removes Most of the 5