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(B) According to Chargaff's rule,the amount of Adenine $(A)$ is equal to the amount of Thymine $(T)$,and the amount of Guanine $(G)$ is equal to the a

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$19$

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(B) According to Chargaff's rule,the amount of Adenine $(A)$ is equal to the amount of Thymine $(T)$,and the amount of Guanine $(G)$ is equal to the amount of Cytosine $(C)$.Given that the percentage of Guanine is $19\%$,the percentage of Cytosine must also be $19\%$ because $G = C$.This rule applies to the $DNA$ of all cells within an organism,whether they are germ cells (like sperms) or somatic cells.

In his experiments on the chemistry of $DNA$,Chargaff estimated the base composition of human sperms and found that Adenine constituted $31\%$ and Guanine $19\%$. The quantity of Cytosine in the $DNA$ of human somatic cell is likely to be (in $\%$)

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