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One E . Coli bacterium contains a hybrid...

One E . Coli bacterium contains a hybrid DNA with one heavy `N^(15)` Strand and one light `N^(14)` Strand. It was allowed ti replicate for 3 hours in a medium containing `N^(14)` What proportion of E. coli which will neither float nor sink in the test tube on ultra - centrifugation with CsCl ?

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