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Question
Explain the processing the hnRNA needs to undergo before becoming functional mRNA eukaryotes.
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Solution
The precursor of mRNA, i.e. hnRNA, contains both introns and exons. Introns are removed and exons are joined by a process called splicing.
The remaining mRNA is processed in two ways:
(1) Capping: Methyl guanosine triphosphate is added to the 5′ end of hnRNA.
(2) Tailing: Adenylate residues are added to the 3′ end of hnRNA.
When hnRNA is fully processed, it is known as mRNA, which is transported out of the nucleus to get translated.
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