E. coli bacteria grew in a nutrient solution containing a heavy, stable isotope of nitrogen, $^{15} N$ . It is then transferred to a medium with the more common light isotope of nitrogen. Then DNA from the cells was extracted and subjected to density centrifugation. The strain of E. coli used to divides once every 20 minutes. The results are illustrated below, the heaviest DNA is extracted from the cells at

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E. coli bacteria grew in a nutrient solution containing a heavy, stable isotope of nitrogen,

^{15} N

. It is then transferred to a medium with the more common light isotope of nitrogen. Then DNA from the cells was extracted and subjected to density centrifugation. The strain of E. coli used to divides once every 20 minutes. The results are illustrated below, the heaviest DNA is extracted from the cells at

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