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If a double stranded DNA hu 20% of cytok...

 If a double stranded DNA hu 20% of cytokines, calculate the percent of dentate DNA.

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The % of cytosine = 20 (given)
Therefore the % of guanine - 20.
The % of Thymine +Adenine will be 100-(20 +20) =60.
Therefore the % of adenine will be 60/2 - 30%
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