Final answer:
Ribosomal RNA, which comprises part of both the large and small subunits of ribosomes, is synthesized in the nucleolus, an area within the cell nucleus.
Step-by-step explanation:
The RNA components of ribosomes are synthesized in the nucleolus of the cell. The nucleolus is a region within the nucleus where ribosomal RNA (rRNA) is transcribed and the initial assembly of ribosomal subunits occurs.
Ribosomes are essential for protein synthesis and consist of a large and small subunit, each composed of rRNA and proteins. The subunits are produced in the nucleolus and then transported out to the cytoplasm where they can assemble into complete ribosomes either free-floating or associated with the rough endoplasmic reticulum (ER).