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JEE Main levelSingle correct optionDifficulty 2 of 3bm216

In a double-stranded DNA the ratio (A + T)/(G + C) is 1.5. The percentage of guanine is

  1. A30%
  2. B40%
  3. C20%
  4. D15%

Answer: C

A + T = 1.5 x (G + C) and the sum is 100%, so G + C = 100/2.5 = 40%. Since G = C, guanine = 20%.
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