Which of the following bacteria lacks a cell wall?

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Staphylococcus aureus

Helicobacter pylori

Bacillus subtilis

Mycoplasma pneumonia

answer is A.

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Detailed Solution

Concept: Mycoplasma is a genus of bacteria that does not have a distinct cell wall over its cell membrane.

Even though these bacteria lack a cell wall, they can effectively protect themselves against antibiotics which have a mode of action of inhibiting cell wall synthesis.

Hence, the correct option is 1

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