avery macleod mccarty

avery macleod mccarty - The Avery-MacLeod-McCarty...

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The Avery-MacLeod-McCarty experiment was an experimental demonstration, reported in 1944 by Oswald Avery , Colin MacLeod , and Maclyn McCarty , that DNA is the substance that causes bacterial transformation . What does it prove? It proves there is genetic information in DNA. It proves it because in the experiment a harmless strain of a disease was transformed into a harmful one. Obviously some factor had to cause this change. The genetic information of the sterilized harmful strain was transferred to the non-harmful strain giving it some characteristics of the harmful one even though the harmful one had been disabled. They proved DNA was the culprit and ruled out RNA, proteins, lipids, etc by adding an enzyme, which breaks down these substances to each. When DNA was broken down the mouse, which the transformed strain was injected into, did not get sick proving DNA was the culprit. The  Hershey- Chase   experiment  was a series of experiments  conducted  in 1952  by Alfred       hershey      and Martha       chase      that identified DNA  to be the genetic material  ofphages  and, ultimately, of all  organisms. A phage is a small virus  that infects bacteria . It consists of a protein  coat that encloses the genetic material.  When a phage infects a bacterium, it inserts its genetic material into the bacterium, while its coat remains outside. In a first experiment, T2 phages
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This document was uploaded on 10/15/2010.

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avery macleod mccarty - The Avery-MacLeod-McCarty...

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