According to Chargaff's base pairing rules, thymine (T) always pairs with adenine (A) and cytosine (C) always pairs with guanine (G). In DNA, the amount of adenine is equal to the amount of thymine, and the amount of cytosine is equal to the amount of guanine.
If 15% of the DNA sample is made up of thymine (T), then 15% of the sample is also made up of adenine (A).
Since the total amount of thymine (T) and adenine (A) in DNA is equal to the total amount of cytosine (C) and guanine (G), the remaining percentage must be split equally between cytosine (C) and guanine (G).
So, if 15% of the sample is made up of thymine (T) and 15% is made up of adenine (A), then 70% (100% - 15% - 15%) of the sample is made up of cytosine (C) and guanine (G).
Therefore, the percentage of the sample made up of cytosine is 70%.
According to Chargaff’s base pairing rules, if 15% of the DNA sample is made up of thymine, what percentage of the sample is made up of cytosine?
%
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