Discussion
Which genus of bacteria does NOT have cell wall?
Answer: C
The genus without a cell wall is Mycoplasma.
Mycoplasmas have no peptidoglycan cell wall at all. Their cell membrane contains sterols, which give it some strength, and they are among the smallest free-living organisms. With no wall, they are naturally resistant to penicillin and other antibiotics that act on cell-wall synthesis, and they have no fixed shape.
Lactobacillus and Staphylococcus are Gram-positive bacteria with thick peptidoglycan walls, and Escherichia is Gram-negative, with a thin peptidoglycan layer and an outer membrane; all three have cell walls.
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