According to Chargaff's rules, if a DNA sample contains 20% Adenine, what is the percentage of Guanine?
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Correct answer: 30%
Chargaff's rules state that A=T and G=C. If A is 20%, then T is also 20% (total 40%), leaving 60% for G and C combined, which means Guanine must be 30%.
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