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Which of these is NOT one of the recognised classes of viral genome?

  • A.Single-stranded DNA
  • B.Single-stranded protein
  • C.Double-stranded DNA
  • D.Double-stranded RNA

Answer: B

A genome is always nucleic acid, so there is no protein class; the six classes are double- and single-stranded DNA, double-stranded RNA, plus- and minus-sense single-stranded RNA, and the retroviruses. Prions are proteinaceous but are not viruses and have no genome.

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