Evidence for SCR?

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by inkhybrid

by inkhybrid

-replicating bacterial DNA in 2 types of nitrogen isotopes, 15N and 14N

15N=heavy isotope

14N= light isotope

-nitrogen found in nitrogenous bases of DNA

-Bacterial DNA made of 15N will have a heavy density

-Bacterial DNA made of 14N will have a light density

Experiment: bacterial DNA made of 15N is replicated in an enviroment of 14N - produces DNA molecule with half 15/14N, therefore DNA molecule has a medium density.