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The great majority of plant viruses have genomes made of

  • A.RNA
  • B.double-stranded DNA
  • C.single-stranded DNA
  • D.both DNA and RNA

Answer: A

Almost all plant viruses carry RNA, most of it positive-sense single-stranded, tobacco mosaic virus being the type example. The DNA plant viruses, such as the geminiviruses and caulimoviruses, are a small minority by comparison.

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