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The bacterium that lacks a cell wall is

  • A.Treponema
  • B.Mycoplasma
  • C.Staphylococcus
  • D.Klebsiella

Answer: B

Correct answer: Mycoplasma

Mycoplasma has no cell wall - its membrane is strengthened with sterols instead - so it is pleomorphic and naturally resistant to penicillin and every other drug that attacks wall synthesis. Treponema, Staphylococcus and Klebsiella all have walls.

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