NEET2026BiologyChapterActual
Select the incorrect statement regarding the processing of heterogeneous nuclear RNA (hnRNA) in eukaryotes.
Options
- ADuring capping, an unusual nucleotide (methyl guanosine triphosphate) is added to the 5'-end of the primary tr
- BIn tailing, approximately 200-300 adenylate residues are added at the 3'-end in a template-dependent manner.
- CThe process of splicing involves the removal of introns and joining of exons in a defined order, representing
- DThe fully processed hnRNA is called mRNA and is transported out of the nucleus for translation.
Correct answer
B. In tailing, approximately 200-300 adenylate residues are added at the 3'-end in a template-dependent manner.
Step-by-step solution
In eukaryotes, the primary transcript (hnRNA) undergoes processing to become functional mRNA. During capping, an unusual nucleotide, methyl guanosine triphosphate, is added to the 5'-end of the hnRNA. During tailing, 200-300 adenylate residues are added at the 3'-end in a template-independent manner by the enzyme poly-A polymerase. Splicing involves the removal of non-coding introns and the joining of coding exons in a defined order, which is a remnant of the RNA world. The fully processed hnRNA is called mRNA, whi