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JEE Advanced levelSingle correct optionDifficulty 3 of 3bm217

One strand of a double-stranded DNA has the composition A 24%, T 32%, G 26%, C 18%. Using strand complementarity, the overall percentage of guanine in the double-stranded DNA (taking both strands together) is

A22%
B26%
C18%
D28%

Answer: A

Guanine in the complementary strand = cytosine of the given strand = 18%. Overall G = (26 + 18)/2 = 22%. (Overall A = (24 + 32)/2 = 28%.)

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