A bacterium grown over medium having radioactive Sulphur incorporates radioactivity in
Medium
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b Few bacteriophages when grown in bacterial culture containing $35 \mathrm{~S}$. It was observed that radioactivity was incorporated into the cysteine and methionine amino acids of proteins and thus these amino acids with $35 \mathrm{~S}$ formed the proteins of phage.
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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