- A They possess an unusually thick peptidoglycan cell wall structure
- B They are the smallest living cells and lack a cell wall
- C They are obligate photosynthetic autotrophs lacking any cell wall
- D They belong specifically to kingdom Protista among microorganisms
Correct answer: B. They are the smallest living cells and lack a cell wall
Explanation: Mycoplasma (PPLO, pleuropneumonia-like organisms) are the smallest known living cells, lacking a cell wall, and can survive without oxygen. They belong to kingdom Monera.
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.