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Virions are described as metabolically inert because they

  • A.are unable to bind to any cell
  • B.carry out no chemical reactions outside a host cell
  • C.cannot be inactivated by heat, drying or disinfectant
  • D.contain no protein at all

Answer: B

Outside a cell a virion neither respires nor synthesises anything; it is a stable package awaiting delivery. That inertness is why viruses were long argued not to be alive, and why they can persist on surfaces without any nutrient supply.

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