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If a DNA double helix, among all nitrogenous bases, 30% is adenine. What is the ratio of A + T and G + C in that DNA

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1 : 1

3 : 7

1 : 3

3 : 2

answer is D.

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Detailed Solution

[A] = 30%, therefore, % of [T] is also 30%. Thus, [G]+[C] = 100 - 60 = 40%. [G] = 20% and [C] = 20%.

$∴$ The ratio of A + T and G + C in that DNA= 60:40=3:2.

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