In an experimental situation, a student researcher inserts an mrna molecule into a eukaryotic cell after she has removed its 5 cap and poly-a tail. which of the following processes would you expect her to find to have occurred?
a. the mrna could not exit the nucleus to be translated.
b. the cell recognizes the absence of the tail and polyadenylates the mrna.
c. the molecule is digested by restriction enzymes in the nucleus.
d. the molecule is digested by exonucleases since it is no longer protected at the 5' end.
e. the molecule attaches to a ribosome and is translated, but more slowly.

D

Explanation:

The molecule is digested by exonucleases since it is no longer protected at the 5' end. The poly (A) tail is an addition of multiple adenosine monophosphate in a process call polyadenylation. The process is important for nuclear export, translation and stability.

While the 5' end plays significant importance in the production of mature mRNA. It is the point of post-transcriptional capping.  The capping increases the stability of mRNA while it undergoes translation. It also provide resistance to the degradative activities of exonucleases.

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