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The genome of hepatitis B virus is

  • A.segmented double-stranded RNA
  • B.circular, partially double-stranded DNA
  • C.linear, fully double-stranded DNA
  • D.single-stranded positive-sense RNA

Answer: B

The genome is remarkably compact at about 3.2 kilobases and is only partly double-stranded, the gap being completed in the infected cell. Despite being DNA it is copied through an RNA intermediate by a reverse transcriptase.

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