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The enzymes a poxvirus needs to begin transcription are

  • A.produced only after cell death
  • B.carried in the virion
  • C.supplied by the host nucleus
  • D.absent altogether

Answer: B

Virion-associated enzymes are important for replication and travel inside the particle, since the cytoplasm offers none of the transcription machinery a nuclear virus would borrow. This is the same logic that makes the DNA alone non-infectious.

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