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(D) In eukaryotes,the primary transcript (pre-$mRNA$) undergoes post-transcriptional modifications.One of these modifications is polyadenylation,where

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$mRNA$ of eukaryotes

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(D) In eukaryotes,the primary transcript (pre-$mRNA$) undergoes post-transcriptional modifications.One of these modifications is polyadenylation,where a poly-$A$ tail (consisting of $200-300$ adenine residues) is added to the $3'$ end of the $mRNA$ molecule.This tail protects the $mRNA$ from degradation and assists in its export from the nucleus to the cytoplasm.Therefore,the poly-$A$ tail is a characteristic feature of eukaryotic $mRNA$.

Poly $A$ tail is present in

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