Q. 22

(i) Name the enzy

Answer :

i) The enzyme which catalyses the transcription of hnRNA is the DNA independent RNA polymerase.

ii)hnRNA undergoes changes so as to convert non-functional hnRNA to functional mRNA.

The changes which take place are :

a) RNA Splicing: In this process the introns are removed from the RNA and exons are left and joined together via ligase.

b) Capping: In this process a 7-methyl guanosine triphosphate nucleotide is added to the 5’ end of the hnRNA.

c) Tailing: In this process the 3’ end is adenylated

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