Question

Which of the following statement about nucleus and nucleolus is correct?

• A. The nucleus is membrane-bound while the nucleolus is not membrane-bound.
  
• B. The nucleolus is membrane-bound while the nucleus is not membrane-bound.
  
• C. Both nucleolus and nucleus are membrane-bound.
• D. Both nucleus and nucleolus are not membrane-bound.

Answer 1

Answer: (A)

The nucleus is membrane-bound while the nucleolus is not membrane-bound.

Nucleus is a membrane-bound structure which is separated from the cytoplasm by the nuclear membrane. Nuclear membrane has small pores which allow diffusion.

Nucleolus is the central dark part of the nucleus which is not surrounded by any kind of membrane. It is the site of ribosome synthesis.

So, the correct option is 'A'.