Question

Name 3 post transcriptional modifications of eukaryotic mRNA and briefly explain the purpose of each

Answer 1

The post transcriptional modifications and their purposes are :

1 . Splicing :

Here the introns are removed from the mRNA , and the exons are joined in a specific order. The process removes the non functional portions of primary transcripts.

2. Capping :

Methyl guanosine triphosphate is added to the 5'-end of the hn RNA molecule. This provides stability to the molecule.

3. Tailing :

200-300 residues of adenylate are added to the 3'-end of the molecule . The purpose is to prevent the molecule from enzymatic degradation in the cytoplasm.