Which of the following is correct?

1. Cells of all living organisms have a nucleus.

2. Both animal and plant cells have a well defined cell wall.

3. In prokaryotes, there are no membrane bound organelles.

4. Cells are formed de novo from abiotic materials.

Membrane-bound organelles are organelles surrounded by a double membrane. Nucleus, mitochondria, chloroplasts, etc., are examples of such organelles. These cells organelles are absent from prokaryotes.