Assuming 15% of the bases are thymine(T). The percentage of the bases in this sample are adenine (A) is: A 15%.
DNA sample which full meaning is Deoxyribonucleic acid is the sample collected that can be use to determine the genes of all living things.
Both thymine and adenine are chemical that can be found in a DNA sample and since DNA sample often contains 15% thymine then their are exactly or the same 15% bases of adenine in a DNA sample.
Therefore the percentage of the bases in this sample are adenine (A) is: A 15%.
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