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Biology · 2024 · 3 marks
CBSE 2024 · Region 5 · Set 1 · Q27
Explain the processing of heterogeneous nuclear RNA (hnRNA) into a fully functional mRNA in eukaryotes. Where does this processing occur in the cell?
Explain the processing of heterogeneous nuclear RNA (hnRNA) into a fully functional mRNA in eukaryotes. Where does this processing occur in the cell ?
Marking-scheme solution
hnRNA undergoes capping at $\displaystyle 5$'-end (methyl guanosine triphosphate or
mGppp), and tailing at $\displaystyle 3$'-end (with polyA tail or adenylate residues) , Further splicing is carried out, where the non-coding or introns are removed, and coding sequences or exons are joined together in a defined mannerSite of processing of hnRNA- nucleus.
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