Why are mRNAs capped at their 5\'-ends (5? m7G) and polyadenylated at the 3\' en

Question

Why are mRNAs capped at their 5'-ends (5? m7G) and polyadenylated at the 3' end (AAAn)? A) capping and polyadenylating a mRNA molecule signals initiation of translation. B) they are capped and polyadenylated to confer polarity to the mature mRNA. C) tagging the 5'- and 3'-end of a nascent mRNA molecule that undergoes extensive processing such as splicing, is a way to identify the true mRNA molecule from all the other RNA molecules that coexist in the nucleus. D) tagging the 5'- and 3'-end of a nascent mRNA molecule that undergoes extensive processing such as splicing, is a way to label certain mRNA molecules destined to destruction.

Explanation / Answer

Why are mRNAs capped at their 5'-ends (5? m7G) and polyadenylated at the 3' end (AAAn)?

A) Capping and polyadenylating a mRNA molecule signals initiation of translation.

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