Cell wall lack microorganism

Answer: Option D

The cell wall lacks microorganism MLO.
Mycoplasmas (MLO) are fastidious bacteria that lack a cell wall. They belong to the class Mollicutes and are the smallest known free-living organisms.
Many require sterols for growth, and Ureaplasma species require urea for fermentation. Mycoplasmas measure only 0.3 to 0.8 µm in size.