Nucleus

Question

The nucleolus is primarily the site of synthesis for which RNA component?

RankGuru · Accepted Answer

1. **Nucleolus**: A dense, non-membrane bound structure within the nucleus.
2. **Function**: It is the 'ribosome factory' of the cell.
3. **rRNA Synthesis**: Here, ribosomal DNA ($rDNA$) is transcribed into **ribosomal RNA ($rRNA$)**.
4. **Subunit Assembly**: The nucleolus is also the site where newly synthesized $rRNA$ is combined with proteins imported from the cytoplasm to assemble the large and small **ribosomal subunits**.
5. **Note**: $mRNA$ and $tRNA$ are synthesized by $RNA$ polymerase II and III respectively in other regions of the nucleoplasm.

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Nucleus

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