Question

Name the enzyme that transcribes hnRNA in eukaryotes. Explain the steps that the hnRNA undergoes before it is processed into mRNA.

Answer 1

RNA polymerase II Enzyme

Explanation:

• The enzyme that interprets hnRNA in eukaryotes is RNA polymerase II. hnRNA represents heterogeneous atomic RNA.  
• The means that the hnRNA experiences before it is handled into mRNA are:  
• Capping: Methyl guanosine triphosphate is added to the 5' finish of the hnRNA.  
• Tailing: Adenylate deposits are added to the 3' end in a layout autonomous way. This structures a poly-A tail.

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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