Which of the following is true for nucleolus?
Answer: (D) It is a site for active ribosomal RNA synthesis. Answer: (D) It is a site for active ribosomal RNA synthesis Solution: The nucleolus is a site for active ribosomal RNA synthesis.
- 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✓
Correct Answer
(D) It is a site for active ribosomal RNA synthesis
Solution & Explanation
Answer: (D) It is a site for active ribosomal RNA synthesis Solution: The nucleolus is a site for active ribosomal RNA synthesis. It is not a membrane-bound structure; its content is continuous with the rest of the nucleoplasm. It does not take part in spindle formation (that is the role of centrioles), and larger and more numerous nucleoli are present in cells actively carrying out protein synthesis, not specifically dividing cells. NCERT Reference: Ch 8, p.100, lines 42-43: "active ribosomal RNA synthesis. Larger and more numerous nucleoli are"