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Fredrick Griffith
Griffith studied 2 types of two strains of bacteria that cause pneumonia. He then injected both strains the rough (R) and Smooth (S) strains into mice.The S strain killed the mice until it was heated up, then it did not kill micee. The R strain only killed the mice in conjuction with some heated up S strain. This experiment led to many others by other people in order to find out what the substance was. -
Oswald Avery
He identified the molecule that transformed the R strain of bacteria into the S strain. Avery isolated various proteins, lipids, and DNA from dead S cells. When the R cells recieved some of the S cell's DNA. Avery concluded that when the S cells died DNA was released and some of the DNA went onto the R cell and transformed the R cells into S cells. -
Erwin Chargaff
Chargaff was responsible for an important rule, The rule was to show that in natural DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units. -
Maurice Wilkins
Wilkins was the leader of the group of people who dicsovered and defined DNA, and contributed to many scientific reseach fields including radar. -
Rosalind Franklins
She took the famous photo dubbed photo 51. She took a picture of DNA and it looked as if DNA was a double helix, photo 51 would be used by Watson and Crick. -
Hershey and Chase
Alfred Harshey and Martha Chase published imformation that showed that DNA was the changing factor in thee molecules. They used bacteriophage( a type of virus that attacks bacteria) to prove that DNA was the genetic material. -
Watson and Crick
Watson and Crick built a model of a double helix, with the help of Franklin's xray diffraction picture and Erwin Chargaff. -
P.A. Levene
He discovered that nucleotides make up the basic structure of DNA. There are two types of nucleic acids in your DNA, are DNA and RNA. -
Linus Pauling
He proposed that DNA was not a double helix, though it was a triple helix.
