- A cell wall
- B nucleus
- C ribosome
- D cytoplasm
Correct answer: A. cell wall
Explanation: Mycoplasmas have no cell wall, the smallest living cells known.
Concept context
Whittaker's five kingdom system covering Monera, Protista, Fungi, plus viruses, viroids, and lichens. A foundational NEET chapter on how living organisms are grouped.