Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

1. Eukaryotes have split genes.
2. Primary transcript or hnRNA is non-functional and contains both exons and introns.
3. Processing of hnRNA results in functional m-RNA.
4. The fully processed hnRNA is called m-RNA.
5. m-RNA comes out of the nucleus through nuclear pore for getting translated.

hnRNA undergoes capping, tailing and splicing.

1. Capping : Methylated guanosine tri¬phosphate is added to 5’ end of hnRNA.
2. Tailing : Polyadenylation take place at 3′ end.
3. Splicing : It is removal of introns.
4. DNA ligase joins exons in a definite sequence (order).