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KCET2026BiologyMolecular Basis of Inheritance

In a DNA molecule, cytosine is 28 % . Calculate the percentage of adenine.

Options

  1. A56 %
  2. B36 %
  3. C22 %
  4. D18 %

Correct answer

C. 22 %

Step-by-step solution

According to Chargaff's rule for double-stranded DNA, the percentage of adenine equals thymine, and cytosine equals guanine. Given, Cytosine ( C ) = 28 % Therefore, Guanine ( G ) = 28 % Total percentage of C + G = 28 % + 28 % = 56 % Remaining percentage for A + T = 100 % - 56 % = 44 % Since A = T , the percentage of Adenine ( A ) = 44 % 2 = 22 % Answer: 22 %

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