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Viruses are described as obligate intracellular parasites because they

  • A.always kill the cell they enter
  • B.cannot generate energy or replicate alone
  • C.are always smaller than a bacterial cell
  • D.can only be seen with an electron microscope

Answer: B

The defining constraint is metabolic, not physical: a virus carries no machinery for generating energy or synthesising proteins, so it can only replicate inside a cell that supplies both. Size and visibility are consequences of its simplicity, and many viruses leave the host cell alive.

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