Which mRNA modification is likely absent if the mRNA is degrading prematurely from the 5' end of the mRNA?
A)addition of the 3' polyadenylated tail
B)splicing together of exons
C)addition of the 7- methylguanosine cap to the 5' end
D)RNA editing
E)removal of introns

Question

Quizplus · Accepted Answer

The 7-methylguanosine cap is added to the 5' end of the mRNA during transcription and is important for stability and translation efficiency. If the mRNA is degrading prematurely from the 5' end, it suggests that the cap is absent or not properly formed. The other mRNA modifications listed (polyadenylation, splicing, RNA editing, and intron removal) occur at the 3' end or within the coding region and would not necessarily affect 5' end degradation.

Which MRNA Modification Is Likely Absent If the MRNA Is