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Biochemical analysis of a sample of DNA shows that cytosine forms 40% of the nitrogenous bases. Which percentage of the bases is adenine?

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Biochemical analysis of a sample of DNA shows that cytosine forms 40% of the nitrogenous bases. Which percentage of the bases is adenine? 

(a) 10% 

(b) 20% 

(c) 40% 

(d) 60%

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Correct option is (a) 10%

According to Chargaff’s rule, 

A + T = G + C and A = T and G = C.

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