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Parvoviruses are unusual among animal viruses in having a genome that is

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

Answer: B

Most DNA viruses of animals carry double-stranded genomes; the parvoviruses and circoviruses are the single-stranded exceptions. Their very small genome is also why parvoviruses depend heavily on host functions and replicate only in dividing cells.

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