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The range of cells a particular virus can infect is determined largely by

  • A.the thickness of the host cell wall
  • B.the temperature at which the host lives
  • C.whether the cell is dividing
  • D.whether the cell carries a matching receptor

Answer: D

Attachment is a specific binding event, so a cell without the matching surface constituent cannot be entered however permissive its interior might be. This is why tropism is often described first in terms of receptors, and why receptor distribution predicts which tissues a virus damages.

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