bacterium. virus. prokaryote. eukaryote.
I gave my students this multiple choice question: A researcher observes membrane-bound structures in a cell. Based on this observation, the researcher can conclude that the cell is classified as a

Only one answer is correct among these 4 choices:
- bacterium.
- virus.
- prokaryote.
- eukaryote.

Could you tell me which one is correct?

eukaryote.