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What are the functions of (i) methyl...

What are the functions of
(i) methylated guanine cap?
(ii) poly-A 'tail' in a mature on RNA ?

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(i) Methylated guanine cap helps I binding of mRNA to smallar ribosomal sub-unit during initiation of translation.
(ii) Poly-A tail provides longevity to mRNA's life. Tail length and longth ans longevity of mRNA are positively ocrrelated.
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