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The main practical limitation of ultraviolet radiation as a sterilizing agent is its

  • A.requirement for high pressure
  • B.very poor penetrating power
  • C.inability to damage nucleic acid
  • D.tendency to leave a toxic residue

Answer: B

Ultraviolet light is stopped by glass, plastic, dust, liquid and any layer of organic soil, so it acts only on directly exposed surfaces and air. It is useful for cabinets and room air, and useless for anything wrapped or shadowed.

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