Question

In a double stranded DNA molecule, the percentage of cytosine is 18. What would be the percentage of adenine?

• A. 36%
• B. 64%
• C. 32%
• D. 18%

Answer 1

The correct option is C 32%

According to Chargaff’s rule in a DNA molecule A = T and G = C and A + G + C + T = 100%. Here cytosine (C) is 18% hence G = 18% $\therefore$ A + T = (100 – 36)% $\therefore$ A + T = 64% $\therefore$ A = 32%