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The nucleic acid of a virus consists of

  • A.DNA only
  • B.RNA only
  • C.either DNA or RNA, never both
  • D.both DNA and RNA in every virion

Answer: C

A virion carries one kind of genome, either DNA or RNA, and this is one of the clearest differences from a cell, which always contains both. Whichever it carries may be single or double stranded, which is what the classification into genome classes records.

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