If a DNA molecule contains 20% thymine, what percentage of guanine would it contain?

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Multiple Choice

If a DNA molecule contains 20% thymine, what percentage of guanine would it contain?

Explanation:
Chargaff’s rules state that in double-stranded DNA, A pairs with T and G pairs with C, so their amounts are equal. If thymine is 20%, adenine must also be 20%, totaling 40%. The remaining 60% of bases must be split evenly between guanine and cytosine, giving 30% guanine and 30% cytosine. Therefore guanine would be 30%.

Chargaff’s rules state that in double-stranded DNA, A pairs with T and G pairs with C, so their amounts are equal. If thymine is 20%, adenine must also be 20%, totaling 40%. The remaining 60% of bases must be split evenly between guanine and cytosine, giving 30% guanine and 30% cytosine. Therefore guanine would be 30%.

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