Which of the following statements is correct regarding the $DNA$ molecule?
- AThe ratio of $Adenine$ to $Thymine$ varies significantly among different organisms.
- BIt consists of two strands that run antiparallel,one in the $5' \rightarrow 3'$ direction and the other in the $3' \rightarrow 5'$ direction.
- CThe total amount of $Purine$ and $Pyrimidine$ nucleotides is always equal.
- DIt consists of two strands that run parallel in the $5' \rightarrow 3'$ direction.
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