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Question

In mammalian cells, rRNA is produced in

A
Nucleus
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B
Ribosome
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C
Nucleolus
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D
Golgi bodies
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Solution

The correct option is B Nucleolus
Nucleus is a double membrane bound organelle containing chromosomes which in turn carry DNA molecules; it is site for DNA replication, transcription of mRNA.
Ribosomes are the large cytoplasmic complex of rRNA and a set of protein and serve as site for protein synthesis.
The darkly stained body in the nucleus is nucleolus which is involved in ribosome construction. It makes around a nucleolar organizer region on one of the chromosome pairs and synthesizes rRNA.
Golgi body consist of flattened sacs stacked on each other, that serve to processes secretory and synthetic products from the ER and then transport the finished products into cell part or secretes them to the outside of the cell. Correct option is C.

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