NEET Chemistry Nucleic Acids MCQ Question
If a DNA sample contains 20% adenine, what percentage of the sample is cytosine?
20%
30%
40%
60%
Correct Answer
Detailed Explanation
According to Chargaff's rule, in DNA, the amount of adenine (A) is equal to thymine (T) and the amount of guanine (G) is equal to cytosine (C). If adenine is 20%, then thymine is also 20%, leaving 60% for guanine and cytosine combined, so each must be 30%.
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