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Which of the following is true for nucleolus?

(1) It takes part in spindle formation.

(2) It is a membrane-bound structure.

(3) Larger nucleoli are present in dividing cells.

(4) It is a site for active ribosomal RNA synthesis.

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Ans : (4) it is a site for active ribosomal RNA synthesis.

Explanation :

Nucleolus is the spherical structure present in the nucleoplasm. 

It is not membrane-bounded and thus its content is continuous with nucleoplasm. It gets disappear during cell division.

But it provides the site for ribosomal RNA synthesis and also takes part in protein synthesis. 

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