Which of the following statements is incorrect regarding nucleic acids?

  • A
    Some viruses contain single-stranded $DNA$.
  • B
    $RNA$ sometimes exists as a double-stranded molecule.
  • C
    In $\beta-DNA$,one turn has a length of $45 \ \mathring{A}$.
  • D
    $Z-DNA$ has $12$ base pairs per turn.

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