Total number of DNA molecules after environmental change

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SUMMARY

After five generations of DNA duplication in Streptococcus bacteria initially containing radioactive isotope N^{15}, the total number of DNA molecules is calculated to be 64. The confusion arises regarding the distribution of N^{15} DNA molecules when the bacteria are placed in an environment with only N^{14}. It is established that the total content of N^{15} does not change; rather, it is split and distributed among the newly formed bacteria. Therefore, the remaining N^{15} DNA molecules will still be present in the population, albeit diluted with N^{14} DNA.

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1. Suppose DNA molecules of a Streptococcus bacterium contain a radioactive isotope N^{15}, if this bacterium is then put in an environment containing only N^{14} and after 5 generations (DNA duplication), how many N^{15} DNA molecules remain ?



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3. after 5 generations, it is 2^{5+1}=64. But then I become clueless as to how I can reason the eliminated DNAs as well as their remaining number. Oh nooo...Help please...
 
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I don't see why the total content of N15 should change at all. It just gets splitted and distributed over multiple bacteria.
 
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