Site of formation of ribosomal precursor or ribosomal sub-units in a cell

Nucleus

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Nucleolus

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Nucleus body

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Stroma

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Solution

The correct option is A Nucleolus
The nucleolus is a dense rounded, oval and acidophilic body in the nucleus. It is the site where ribosomes are synthesized hence also called factory for ribosomes. Ribosomal proteins are translated by the ribosomes from mRNA outside the nucleus. These are then carried to the nucleolus for the assembly of ribosomal subunits. Thus the correct answer is option B.

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