The nucleolus is primarily involved in the synthesis of:
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Correct answer: Ribosomal RNA (rRNA) for ribosome biogenesis
The nucleolus is the primary site of ribosomal RNA (rRNA) transcription by RNA polymerase I. Both large and small ribosomal subunits are partially assembled in the nucleolus before being exported to the cytoplasm, making the nucleolus central to ribosome biogenesis and thus to all cytoplasmic protein synthesis.
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More Nucleus: Structure, Chromatin, Nucleolus questions
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