Suppose you are a biologist trying to discover the process by which DNA copies itself.You grow cells in a culture that contains a special isotope of nitrogen,N-15,which will become part of any new DNA the cell makes.After one generation,you analyze the DNA and find all the DNA has some N-15 in it.You then take those cells and grow them for another generation in a culture with the normal isotope of nitrogen,N-14,and find that half of the DNA has some N-15 in it and half of it has only N-14.From this information,what can you infer is the process by which DNA replicates?
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