POST TRANSCRIPTION MODIFICATION

Post transcription modification is needed in eukaryotes .

In this process the newly synthesized  pre-messenger RNA or RNA transcript having unusual length is converted into mature RNA .

It involves 

A- Cleavage 

The longer pre mRNA is cleaved to produce RNA of desired length .

B- Motivation 

The primary mRNA gives rise to mature RNA with extensive regulation of transcription 

C- Splicing 

In eukaryotic DNA both exon and sequence present so there may be unnecessary part new RNA .That part cut and exon parts are joined by ligase .

D- Capping 

Capping is dont in 5' with methyl group .

E- Tailing 

This involved addition of 250 adenine residues with a long chain of adenine.