Question

Explain the process of making heterogeneous nuclear RNA (hnRNA) into
a fully functional mRNA in eukaryotes. Where does this process occur in
the cell?​

Answer 1

1.capping at the 5'end: Addition of guanosine triposphate to the 5'end of hnRNA

2.taliling at the 3'end:Addition of 200-300 adenylate residues at the 3'end of hRNA

3.splicing:Removal of introns and joining the exon segment of the transcript

It takes place in the nucleus

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Answer 2

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The precursor of mRNA transcribed by RNA polymerase-|| it is called heterogeneous nuclear RNA .It undergoes following processing to form nascent mRNA :-

1)Splicing:- In this process the non-coding introns are removed and coding sequences call exons are joined in a definite order .This is required because primary transcript contains both introns and exons .

2)Capping:- In this process an unusual nucleotide is added to the 5' end of hnRNA.

3)Tailing:- In this process 200 to 300 adenylated residues are added at the 3' endof hn RNA .

4)The fully process mRNA is released from the nucleus into the cytoplasm for translation .

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