Question

If a dsDNA has 20% adenine, what would be its cytosine content ?

(A) 20%

(B) 30%

(C) 40%

(D) 80%

Answer 1

Correct Option :- B) 30%

Explanation :-

According to Chargaff'* rule, the molar concentration of purines is equal to molar concentration of pyrimidines.

A + G = T + C

So if Adenine is 20% then T is also 20% because A always pairs with T.

Hence G is 30% and C is also 30%