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Question

In sea urchin DNA,which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be present in this DNA are:


  1. G 8.5%, A 50%, T 24.5%

  2. G 17%, A 33%, T 33%

  3. G 34%, A 24.5%, T 24.5%

  4. G 17%, A 16.5%, T 32.5%


Solution

The correct option is B

G 17%, A 33%, T 33%


According to Chargaff’s rule, the amount of purine is always equal to the amount pyramidines.

[A] = [T] , [G] = [C], [A] + [G] = [C] + [T]

Therefore [G] = 17%, [A] = [T] = 33%

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