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Ultraviolet light damages microorganisms mainly by

  • A.forming pyrimidine dimers in their DNA
  • B.oxidising the lipids of the cell membrane
  • C.coagulating the cytoplasmic proteins
  • D.stripping water from the cytoplasm

Answer: A

Ultraviolet radiation is absorbed by nucleic acid and links adjacent pyrimidines into dimers, which blocks replication and transcription. Absorption peaks near 260 nanometres, which is why germicidal lamps are built to emit close to that wavelength.

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