The nucleolus is the site of
- A. DNA replication
- B. synthesis of ribosomal RNA and assembly of ribosomal subunits
- C. protein synthesis for export
- D. storage of the cell's lipid reserve
Explanation
The nucleolus is a dense region of the nucleus with no membrane around it, and it transcribes ribosomal RNA and combines it with proteins to form the subunits that are then exported through the nuclear pores. Cells making large quantities of protein have prominent nucleoli, which is a useful clue under the microscope. Protein synthesis itself takes place on the ribosomes in the cytoplasm.
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