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Question

If a double stranded DNA has 20% of cytosine, what will be the percentage of adenine in it?

A
20%
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B
30%
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C
40%
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D
60%
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Solution

The correct option is B 30%
According to Chargaff’s rule
A = T and C = G;
A + G + T + C = 100%
2 A + 2 C = 100%
2 A + 2(20) = 100%
A = 30%

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