Nucleoli are rich in

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(D) The nucleolus is a non-membrane-bound structure present within the nucleus of eukaryotic cells.It is the site for active ribosomal $RNA$ $(rRNA)$

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$RNA$ and proteins

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(D) The nucleolus is a non-membrane-bound structure present within the nucleus of eukaryotic cells.It is the site for active ribosomal $RNA$ $(rRNA)$ synthesis.Therefore,the nucleolus is primarily composed of $RNA$ and proteins,which are required for the assembly of ribosomes.While it is associated with the nucleolar organizer regions of chromosomes (which contain $DNA$),the nucleolus itself is chemically rich in $RNA$ and proteins.

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