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The first step in the multiplication of an animal virus is

  • A.uncoating of the genome
  • B.assembly of progeny virions
  • C.release by budding
  • D.attachment to a cell surface receptor

Answer: D

Attachment is the specific binding of a virion protein, the anti-receptor, to a constituent of the cell surface that serves as receptor. Nothing else can follow until that contact is made, which is also why the step is such an attractive target for neutralising antibody.

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