Question

Which statements correctly describe Mycoplasma?
1. They lack a cell wall.
2. They can survive without oxygen.
3. They are the smallest known free-living organisms.
4. Their cell membrane contains sterols.

• A. 1, 3, 4
• B. 2 and 4
• C. 1, 2, 3
• D. 1, 2, 3, 4

Hint:

Mycoplasmas are pathogenic in both plants and animals.
Remember that because they completely lack a cell wall, they are unaffected by antibiotics like penicillin, which target cell wall synthesis.
Instead, they are treated with antibiotics that inhibit protein synthesis (such as tetracyclines or macrolides).

Answer 1

The Correct Option is D

Step 1: Verify all 4 Mycoplasma facts.
No cell wall (1) true; facultative anaerobes (2) true; smallest free-living organisms (3) true; membrane has sterols (4) true. All four are correct.
Answer: 1, 2, 3, 4