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Alcohols act on microorganisms by

  • A.chelating essential metal ions
  • B.denaturing proteins and dissolving membrane lipids
  • C.oxidising the sulphydryl groups of enzymes
  • D.alkylating the bases of nucleic acid

Answer: B

Alcohol unfolds proteins and disrupts the lipid of the membrane, killing vegetative bacteria, fungi and enveloped viruses quickly. It is not sporicidal, which is why alcohol hand rub is inadequate against Clostridioides difficile.

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