The nucleus of a eukaryotic cell is enclosed by the nuclear membrane which protects the cell’s genetic material. It is also known as the nuclear envelope. This membrane is a lipid bilayer that permits the selective entry and exit of biomolecules through nuclear pores. Damage to this membrane often results in cell death.

In prokaryotic cells, a well defined nucleus does not exist. Instead, generic material is present in a structure known as a nucleiod. The nucleiod is arranged into a loose structure by the action of certain proteins but is not enclosed by any membrane.

• This reply was modified 3 months ago by  Gavin Menezes.