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If a double stranded DNA has 20 percent ...

If a double stranded DNA has 20 percent of cytosine, calculate the percent of adenine in the DNA.

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The percentage of cytosine is 20. Cytosine always pairs with guanine. So the percentage of cytosine and guanine is 40 (20 + 20). The remaining 60% is for both adenine and thiamine which also pair in equal proportion. So the percentage of adenine is 30 (30 + 30).
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