What is the difference between Nucleus and Nucleolus?

Nucleus:

1. It is a large spherical structure present in the cell.

2. It is bounded by nuclear envelope.

3. It contains chromosomes.

4. It is rich in DNA, the genetic material.

Nucleolus:

1. It is very small and is present inside the nucleus.

2. It has no limiting membrane.

3. It does not possess any chromosome, but is organized on one chromosome(Nucleolar organiser).

4. It is rich in RNA.

5. It is involved in ribosome synthesis.