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A minus-sense single-stranded RNA virus must carry into the cell its own

  • A.reverse transcriptase
  • B.DNA ligase
  • C.ribosome
  • D.RNA-dependent RNA polymerase

Answer: D

The host has no enzyme able to copy RNA into RNA, and a minus-sense genome cannot be translated as it stands, so the polymerase must arrive packaged in the virion. Reverse transcriptase is what retroviruses carry instead, and no virus carries a ribosome.

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