Question

Eukaryotes like to modify their mRNA after / during transcription. What do they do to it and why?

Answer 1

Three modifications occur to the mrna in eukaryotes.

First is splicing. Splicing occurs to remove introns form the mrna and to join exons. Different combinations of exons are also joined to make different proteins from one gene.

Seomd is 5' caping and it occurs to protect the nascent mrna from degradation and also assist in ribosomal binding site.

Poly A tail protects mRNA from enzymatic degradation cytoplasm and aids in transcription termination. This suggests that mrna is ready to transport mrna from nucleus.