Answer: They have 70S ribosomes and circular DNA.
- A They are bound by a single membrane
- B They completely lack their own DNA
- C They have 70S ribosomes and circular DNA
- D They are found only in plant cells
Correct answer: C. They have 70S ribosomes and circular DNA
Explanation: Mitochondria have their own circular DNA, 70S ribosomes and a double membrane - features of free-living prokaryotes, supporting an endosymbiotic origin.
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.