Plz solve this question,,,

Dear student,
Please find below the answer:

The correct option is (A).
According to Chargaff's rule, the amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to cytosine. 20 coils of DNA will have 200 base pairs. Now, here No.of adenine molecules represent no. of A-T pairs. So it will be 60. We are left with 140 out of 200. Hence, 140 will be G-C pairs, so 140 will be cytosine bases.

Hope this information clears your doubt.
Regards.
 

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