NEETZoologyMolecular Basis of Inheritance
What is capping in the processing of hnRNA in eukaryotes?
Options
- AAdding an unusual nucleotide to the 5'-end of hnRNA
- BAdding adenylate residues to the 3'-end of hnRNA
- CRemoving introns
- DJoining exons in a defined order
Correct answer
A. Adding an unusual nucleotide to the 5'-end of hnRNA
Step-by-step solution
The second complexity is that the primary transcripts contain both the exons and the introns and are non-functional. Hence, it is subjected to a process called splicing where the introns are removed and exons are joined in a defined order. hnRNA undergoes additional processing called capping and tailing. In capping an unusual nucleotide (methyl guanosine triphosphate) is added to the 5'-end of hnRNA . In tailing, adenylate residues (200-300) are added at 3'-end in a template independent manner. It is the fully proc