vacuole nucleoid mitochondrion cytoplasm
I gave my students this multiple choice question: Cells come in two basic types, prokaryotic and eukaryotic. Which cell structure is found in both prokaryotic and eukaryotic cells?

Only one answer is correct among these 4 choices:
- vacuole
- nucleoid
- mitochondrion
- cytoplasm

Could you tell me which one is correct?

cytoplasm