Question

Why after transcription the mrna formed in proaryotes is called nascent mrna?

Answer 1

If you look into the literary/dictionary meaning of the word 'nascent'; you will get to know that it is used to refer to a product which has just come into existence or the process which has just begun.

When the mRNA is just formed after transcription, it is called nascent because the process of translation and translation are coupled in prokaryotes. Therefore, no processing or modification is required in prokaryotes. Since no modification occurs, it is called nascent mRNA.

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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