(i) Name the enzyme that catalysis the transcription of hnRNA.

Explanation

(i)RNA polymerase II
(ii) Because it contains both the exons and the introns and is non-functional Hence, it is subjected to a process called splicing where the introns are removed and exons are joined in a defined order. RNA undergoes two additional processings called capping and tailing In capping an unusual nucleotide (methyl guanosine triphosphate) is added to the 5'-end of hnRNA. In tailing, adenylate residues (200-300) are added at 3'- end in a template independent manner. These all changes occur inside the nucleus and finally the fully processed, hnRNA now called mRNA is transported out of the nucleus for translation