Which of the following is correct for Watson and Crick's model of $DNA$? It is a duplex with

  • A
    $10$ base pairs and $34 \; \mathring{A}$ distance for every turn.
  • B
    $10$ base pairs and $3.4 \; \mathring{A}$ distance for each turn of spiral.
  • C
    $20$ base pairs and $34 \; \mathring{A}$ for each turn.
  • D
    None of the above

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$A$: In a $DNA$ molecule,the proportion of purine and pyrimidine bases is equal.
$R$: In $DNA$,two purines or two pyrimidines do not pair opposite each other.

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