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In a DNA percentage of thymine is 20% then what will be the percentage of guanine?

1. 20%
2. 40%
3. 30%
4. 60%

Correct answer: 30%

Solution

In double-stranded DNA, A = T and G = C. If thymine is 20%, adenine is also 20%, leaving 60% for guanine plus cytosine. Since G = C, guanine is 30%.

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