Which of the following is true for the nucleolus?

It takes part in spindle formation

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It is a membrane-bound structure

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Larger nucleoli are present in dividing cells

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It is a site for active ribosomal RNA synthesis

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Solution

The correct option is D
It is a site for active ribosomal RNA synthesis

Nucleolus is a prominent substructure found within the nucleus. It is the site of rRNA transcription and processing, and of ribosome assembly. Therefore, it is a site for active ribosomal RNA synthesis.

Centrioles are a pair of cylindrical organelles near the nucleus in animal cells, involved in the formation of spindle fibers during cell division.

The nucleus is surrounded by a membrane but the nucleolus is not. Nucleolus disappears during cell division.

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