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Which of the following organisms has sterols in its cytoplasmic membrane?

  • A.Clostridium
  • B.Proteus
  • C.Mycoplasma
  • D.Bacillus

Answer: C

Correct answer: Mycoplasma

Mycoplasma is the exception among bacteria: having no cell wall, it strengthens its membrane with sterols taken up from the host. That is why it needs a sterol-containing medium to grow, and why it is naturally resistant to penicillin.

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