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Solution


Q.

Which of the following is true for nucleolus        [2018]
1 Larger nucleoli are present in dividing cells.  
2 It is a membrane-bound structure.  
3 It takes part in spindle formation.  
4 It is a site for active ribosomal RNA synthesis.  

Ans.

(4)

Nucleolus is naked (devoid of membrane), round or slightly irregular structure which is attached to the chromatin at a specific region called nucleolar organiser region (NOR). Nucleolus is a site for rRNA synthesis. Nucleolus disappears when the cell undergoes division and reappears after its completion.