Which of the following is true for nucleolus ?

Options

A. It takes part in spindle formation
B. It is a membrane-bound structure
C. Larger nucleoli are present in dividing cells
D. It is a site for active ribosomal RNA synthesis

Answer

D

Explanation

Nucleolus is a naked , round or slightly irregular structure in nucleus . It lacks a membrane and its contents are in direct contact with the nucleoplasm . It is a site for active ribosomal RNA (rRNA) synthesis.
Microtubules take part in the spindle formation .
Mitochondria , vacuoles and plastids , etc . are membrane-bound structures . The dividing cells possess a large number of mitochondria.