how is hnrna processed to form mrna
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hnRNA (also known as Pre-mRNA) is a primary transcript formed after transcription of DNA. hnRNA has both introns and exons. To form mature RNA (mRNA) hnRNA go through a process known as splicing to remove unwanted intron from it and also 5' and 3' ends of hnRNA are modified.
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The hnRNA undergoes the following processes to form mRNA:
(i) Capping: Addition of methyl guanosine triphosphate at 5'-end.
(ii) Tailing: Addition of 200-300 adenylate residues at 3'-end.
(iii) Splicing: Removal of introns and joining of exons.
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