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Virions released naturally from a poxvirus-infected cell differ from those extracted artificially in having

  • A.a helical rather than complex structure
  • B.a smaller genome
  • C.an additional outer membrane
  • D.no core at all

Answer: C

Naturally released particles carry an extra outer membrane that is absent from virions freed by breaking cells open in the laboratory. Both forms are infective, but they differ in their surface and therefore in how they are neutralised.

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