Which observation proves that a cell is a eukaryote?
A
It contains DNA
B
It contains ribosomes
C
It has a cell membrane
D
It has DNA inside a nucleus
Correct Answer: It has DNA inside a nucleus
Eukaryotic cells all have a nucleus. Eukaryotes are organisms that are multicellular, although there are some examples of single cellular eukaryotes. So eukaryotic cells can be either cell with a nucleus or a eukaryotic organism's cell.
The most important feature to judge whether it has nucleus membrane.
And for other choices, they are the common features of eukaryote and prokaryote.