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Discussion

Attachment of a virion to its receptor is described as specific because

  • A.a particular virion protein binds a particular cell constituent
  • B.only one virion is able to bind to each susceptible cell
  • C.binding occurs only at a particular temperature
  • D.the bond formed is covalent

Answer: A

The anti-receptor on the virion recognises one constituent of the cell surface, and the fit between them is what decides whether a cell can be infected at all. It is that molecular specificity, not any limit on numbers, that the word describes.

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