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18 December, 14:52

Hershey and Chase grew some virus in liquid containing 35S and another batch of virus in a different flask of liquid containing 32P. Would you expect virus growing in a medium containing 35S to synthesize DNA containing 35S?

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  1. 18 December, 15:20
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    No, since DNA does not have atoms of S (sulfur) in its nucleotide.

    Explanation:

    DNA molecule has several nucleotides that are bonded by a specific type of covalent bond. Nucleotides of DNA have a pentose sugar, phosphate and a nitrogenous base (purines and pyrimidines). None of these components of DNA nucleotides have sulfur atoms in their structure. Therefore, viruses growing in a medium having 35S would not form DNA having these sulfur atoms. Sulfur atoms are present in some of the amino acids of proteins.
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