In an experiment, DNA was found to have $31 %$ adenine and $19 %$ guanine. The quantity of cytosine would have been ___________.

38 %

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31 %

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19 %

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62 %

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Solution

The correct option is C $19 %$
$A = 31 % G = 19 %$ . According to Chargaff rule, A=T and G=C. Cytosine is always equal to guanine as C pairs with G with the help of two hydrogen bonds.

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31 %

19 %

Statement 1: The four nitrogen bases in a DNA molecule are guanine, thymine adenine, cytosine.

Statement 2: Where adenine and thymine are purines and guanine and cytosine are pyrimidines.

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