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Discussion

Viruses are described as obligate intracellular parasites because they

  • A.always kill the cells they enter within a few minutes of entry
  • B.can only infect one species
  • C.require an arthropod vector at every stage
  • D.cannot generate energy or synthesise proteins by themselves

Answer: D

A virion carries no ribosomes, no metabolic pathways and no means of making adenosine triphosphate, so every step of multiplication borrows the cell's machinery. That dependence, not the killing of cells, is what the phrase describes.

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