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A circovirus isometric capsid measures about

  • A.1000 nm
  • B.1 nm
  • C.17 nm
  • D.170 nm

Answer: C

Circoviruses are among the smallest animal viruses, with a capsid of roughly 17 nanometres. Isometric means the particle is equal in its dimensions, the appearance an icosahedral shell presents, in contrast with the elongated form of a helical nucleocapsid.

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