Question

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

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

$A=31\%G=19\%$. 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.