What is the primary function of the nucleolus located inside the eukaryotic nucleus?
Answer and explanation
Correct answer: A. Synthesis of ribosomal RNA (rRNA) and ribosome assembly
- Step 1: The nucleolus is a dense, non-membrane-bound subnuclear region surrounding chromosomal nucleolar organizer regions (NORs).
- Step 2: RNA polymerase I transcribes ribosomal genes into pre-rRNA transcripts within the nucleolus.
- Step 3: These rRNA molecules are processed and assembled with ribosomal proteins imported from the cytoplasm to generate preribosomal subunits.
Answer
Synthesis of ribosomal RNA (rRNA) and ribosome assembly.
Why not the others: Translation of mRNA into proteins occurs in the cytoplasm on mature ribosomes; Replication of mitochondrial DNA occurs autonomously within the mitochondrial matrix; Packaging of secretory vesicles is performed by the Golgi apparatus.
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