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Antibacterial antibiotics are ineffective against viruses because viruses

  • A.are always inside red blood cells
  • B.are destroyed by the drug but reassemble afterwards
  • C.lack the structures such drugs act on
  • D.reproduce too quickly for the drug to act

Answer: C

Antibiotics work by attacking structures and processes peculiar to bacterial cells, and a virus has none of them, using the host's machinery instead. That is also why antiviral drugs are harder to design without harming the host.

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