This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
Which of the following are bounded by membrane containing sterols: March 2011 
Select and explain. 
A. Klebsiella, B. Staphylococcus, C. Mycobacteria, D. Mycoplasma
D: Mycoplasma
Answer: D: Mycoplasma 
Explanation: Ans. D: Mycoplasma Mycoplasma are devoid of cell walls The cells are bounded by a soft trilaminar unit membrane containing sterols