If a double stranded DNA has $20\; \%$ of cytosine, what will be the percentage of adenine in it?
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The purines and pyrimidines are always in equal amounts as per chargaff's rule. So, if cytosine is $20\; \%$, the thymine will be $30 \%$ and thymine is equal to adenine. Then the percentage of adenine will be $30\; \%$.
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