The rna components of ribosomes are synthesized in the
cytoplasm
nucleus
nucleolus
endoplasmic reticulum

Nucleus

Explanation:

In eukaryotic cells the synthesis of RNA occurs in the nucleus. This process is called transcription and the mechanism is mediated by RNA polymerase. The RNA synthesized can be messenger RNA, transcriptional RNA or ribosomal RNA among others. RNA polymerase to synthesize RNA has to read the DNA chain that is that is always inside the nucleus when transcription occurs.

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.