The enzyme that transcribes hnRNA in eukaryotes is RNA polymerase II. hnRNA stands for heterogeneous nuclear RNA.
The steps that the hnRNA undergoes before it is processed into mRNA are:
• Capping: Methyl guanosine triphosphate is added to the 5’ end of the hnRNA.
• Tailing: Adenylate residues are added to the 3’ end in a template independent manner. This forms a poly A tail.
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