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The approximate size range of virions is

  • A.0.1 mm to 1 mm
  • B.17 nm to 1,000 nm
  • C.1 nm to 10 nm
  • D.5 micrometres to 20 micrometres

Answer: B

The smallest virions, such as the circoviruses, are about 17 nm across, while some helical nucleocapsids reach about 1,000 nm. Even the largest is well below the resolution of a light microscope, which is why electron microscopy was needed to see them.

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