Here's a breakdown:
* rRNA: rRNA is transcribed from DNA within the nucleus. Specific regions of DNA called rRNA genes are transcribed into precursor rRNA molecules, which are then processed and assembled into the mature rRNA components of ribosomes.
* Ribosomal proteins: The genes for ribosomal proteins are also located in the nucleus. These genes are transcribed into mRNA (messenger RNA), which then exits the nucleus and travels to the cytoplasm. In the cytoplasm, ribosomes themselves translate the mRNA into the specific proteins needed for ribosome assembly.
In summary: The nucleus acts as the central factory for both the RNA and protein components of ribosomes. These components are then transported out of the nucleus and assembled into functional ribosomes in the cytoplasm.
