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The electron microscope was necessary to visualise viruses because they are

  • A.too motile to be photographed
  • B.destroyed by visible light
  • C.smaller than the resolving power of a light microscope
  • D.transparent to every form of radiation used in microscopy

Answer: C

Even the largest virion is around a thousand nanometres and most are far smaller, well below what visible light can resolve. Electrons have a much shorter wavelength, so the electron microscope revealed both the size and the symmetry of virions for the first time.

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