Which organelle is involved in the production of ribosomal RNA?

The nucleolus is the organelle specifically responsible for the production of ribosomal RNA (rRNA). It is located within the nucleus of eukaryotic cells and plays a crucial role in assembling the components necessary for ribosome formation. The nucleolus synthesizes rRNA and combines it with proteins to form ribosomal subunits, which are then transported to the cytoplasm where they assemble into functional ribosomes, essential for protein synthesis.

While the nucleus serves as the overall control center for the cell, housing the genetic material and overseeing various cellular activities, it is the nucleolus within the nucleus that carries out the specific task of rRNA production. Ribosomes, which are responsible for translating mRNA into proteins, do not produce rRNA; instead, they use rRNA produced by the nucleolus in their structure. The Golgi apparatus is involved in modifying, sorting, and packaging proteins, but it does not play a role in rRNA synthesis. Thus, the nucleolus is the correct answer as it directly relates to the production of ribosomal RNA.