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Retroviruses are distinguished among plus-sense RNA viruses by carrying

  • A.reverse transcriptase
  • B.an RNA-dependent RNA polymerase
  • C.a double-stranded DNA genome
  • D.no enzymes at all

Answer: A

A retrovirus has a plus-sense RNA genome but does not translate it directly; reverse transcriptase copies it into DNA, which then integrates into the host chromosome. That enzyme is the defining feature, and it travels inside the virion because no cell provides one.

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