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The range of cells a virus can infect is limited chiefly by

  • A.the presence of a suitable receptor
  • B.the thickness of the cell wall
  • C.the temperature of the tissue
  • D.the age of the host

Answer: A

Susceptibility depends on the availability of an appropriate receptor, and not all cells in an otherwise susceptible organism carry one. That single requirement explains both host range and tissue tropism, and it is why a virus that binds a lymphocyte marker produces disease in the immune system.

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