Question

One gene has exons lmnop. in nerve cells, the mrna molecules from this gene contain the exons lmn. in muscle cells, the mrna molecules from this contain mno. what causes the difference between the mrna molecules in different tissues?

Answer 1

What causes the difference between the mRNA molecule in different tissue is PRE mRNA SPLICING. Splicing refers to the modification of the nascent precursor messenger RNA.The splicing of a mRNA molecule occur in several steps and the steps are catalyzed by ribonucleoproteins. During splicing, the introns sections are removed and the remain sections called exons are joined together.