In the Meselson-Stahl experiment, cells were grown for one generation in growth medium containing a relatively heavy nitrogen isotope, then transferred to new medium containing a lighter nitrogen isotope. After another round of cell division, what is true of the DNA in the cells?

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Half of the DNA contains only the light nitrogen isotope.

  

All DNA contains only the lighter nitrogen isotope.

  

All DNA contains a hybrid of relatively heavy and light nitrogen isotopes.

  

All DNA contains only the heavy nitrogen isotope.

 

asked Dec 27, 2012 in Biology by anonymous
    

1 Answer

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Half of the DNA contains only the light nitrogen isotope.

 

answered Dec 27, 2012 by anonymous

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