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Penetration of a virus into a host cell is described as

  • A.an energy-dependent step
  • B.a purely passive diffusion
  • C.possible only through the cell wall
  • D.the same event as attachment

Answer: A

Penetration requires energy and proceeds by translocation across the membrane, by endocytosis, or by fusion of a viral envelope with a cell membrane. Attachment by contrast can occur on a cell that is metabolically inactive, because it is only binding.

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