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  1. In a DNA percentage of thymine is 20% then what will be the percentage of guanine?
    1. 20%
    2. 40%
    3. 30%
    4. 60%
Correct Option: C

According to Chargaff's rule, the ratio of purine bases to pyrimidine bases is equal. A = T, C = G. If T is 20% then A is 20% and C and G are 30%, 30%



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