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(B) In eukaryotes,there are three main types of $RNA$ polymerases involved in transcription:$1$. $RNA$ polymerase $I$ transcribes $rRNA$ ($28S, 18S,$

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$RNA$ polymerase $II$

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(B) In eukaryotes,there are three main types of $RNA$ polymerases involved in transcription:$1$. $RNA$ polymerase $I$ transcribes $rRNA$ ($28S, 18S,$ and $5.8S$).$2$. $RNA$ polymerase $II$ transcribes the precursor of $mRNA$,which is known as heterogeneous nuclear $RNA$ $(hnRNA)$.$3$. $RNA$ polymerase $III$ transcribes $tRNA$,$5S$ $rRNA$,and $snRNA$ (small nuclear $RNA$s).Since $mRNA$ is synthesized from $hnRNA$ (the product of $RNA$ polymerase $II$),the correct enzyme is $RNA$ polymerase $II$.

In eukaryotes,$mRNA$ is synthesized with the aid of

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