The nucleus is particularly important among eukaryotic organelles because it is the location of a cell's DNA. Two other critical organelles are mitochondria and chloroplasts, which play important roles in energy conversion and are thought to have their evolutionary origins as simple single-celled organisms.

Why do eukaryotes have a nucleus but prokaryotes don t?

Eukaryotic cells have a nucleus, a membrane-bound chamber where DNA is stored, while prokaryotic cells don't. This is the feature that formally separates the two groups. Eukaryotes usually have other membrane-bound organelles in addition to the nucleus, while prokaryotes don't.

Why dont eukaryotic cells have a nucleus?

Eukaryotic cells have membrane-bound organelles like the nucleus, while prokaryotic cells do not. ... The nucleus is surrounded by the nuclear envelope, a membrane that protects the nucleus and its contents, including DNA. DNA carries genetic information, or instructions for building molecules.