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In the landmark Meselson and Stahl experiment, E. coli bacteria were grown for several generations in media containing nitrogen-15. Later, they transferred the E. coli to media containing nitrogen-14.

They analyzed the DNA after separating the DNA by mass using a centrifuge. The results that they found were shown in the diagram below.

Villarreal, Mariana Ruiz. Meselson-stahl Experiment. Digital image. Wikimedia Commons. N.p., 17 Sept. 2008. Web.

Which of the following was illustrated in the experiment by Meselson and Stahl?


DNA exhibits a double helix structure.


DNA was the molecule of heredity.


DNA copies itself such that each strand is half old and half newly constructed.


Amino acids may have been the first biological molecules formed on Earth.

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