What did Taylor use in his experiment?

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(C) $J$. Herbert Taylor and his colleagues performed experiments on Vicia faba (fava beans) in $1958$ to prove that $DNA$ replication in chromosomes i

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Radioactive thymidine

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(C) $J$. Herbert Taylor and his colleagues performed experiments on Vicia faba (fava beans) in $1958$ to prove that $DNA$ replication in chromosomes is semi-conservative.They used radioactive thymidine ($^3H$-thymidine) to detect the distribution of newly synthesized $DNA$ in the chromosomes.Thymidine is a deoxyribonucleoside that is specifically incorporated into $DNA$ during replication, whereas uracil is found in $RNA$.

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