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  4. In transcription in eukaryotes, heterogenous nuclear RNA (hnRNA) is transcribed by

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Q. In transcription in eukaryotes, heterogenous nuclear $RNA (hnRNA)$ is transcribed by

AMUAMU 2010Molecular Basis of Inheritance

Solution:

Eukaryotes have three $RNA$ polymerases. $RNA$ polymerase $I$ is located in the nucleolus and transcribes for $ rRNAs (28S, 18S$ and $5.8S$) whereas $RNA$ polymerase $II$ is localised in the nucleoplasm and used for $hnRNA, mRNA$ and $RNA$ polymerase $III$ is localised in the nucleus, possibly the nucleolar-nucleoplasm interface and transcribes for $tRNA, 5S rRNA$ and $n RNAs$.