Answer: Eukaryotes only.
- A Prokaryotes only
- B Eukaryotes only
- C Both prokaryotes and eukaryotes
- D Neither
Correct answer: B. Eukaryotes only
Explanation: Nuclear membrane (nuclear envelope) is a defining feature of eukaryotic cells. Prokaryotes have no such membrane.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.