Final answer:
The RNA components of ribosomes are synthesized in the nucleolus within the nucleus.
Step-by-step explanation:
The RNA components of ribosomes are synthesized in the nucleolus within the nucleus of a cell.
Some chromosomes in the nucleus have sections of DNA that encode ribosomal RNA (rRNA). The nucleolus is a dark, dense area within the nucleus where ribosomal RNA is synthesized and aggregated with associated proteins to assemble ribosomal subunits.
Once the ribosomal subunits are assembled in the nucleolus, they are transported out of the nucleus through nuclear pores and into the cytoplasm for further assembly into functional ribosomes.