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  4. If a dsDNA has 20% adenine, what would be its cytosine content?

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Q. If a dsDNA has 20% adenine, what would be its cytosine content?

KVPYKVPY 2016

Solution:

If dsDNA has 20% adenine, then according to the Chargaff s rule, it would have 20% thymine. The remaining 60% represents both G + C. Since guanine and cytosine are always present in equal numbers, the percentage of cytosine molecule is 30%.