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By: Jacob H, Cody, X'zavor
Rosalind Elsie Franklin was an English chemist and X-ray crystallographer who made contributions to the understanding of the molecular structures of DNA, RNA, viruses, coal, and graphite.j

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by jace and abi
They showed that DNA can tranforms the properties of cells To show this they injected mice with the R strain into the S strain and this killed bacteria. This showed ut was DNA not protein.

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They discovered the chemical structure of dna. People had already discovered some of the structure so they just used common physics and past info to find out. They learned that it was a double helix. and they discovered that it has two strains combined     thats how it forms the double helix

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by X'zavor,Cody, Jacob
Hershey/Chase concluded that  DNA, not protein, was a genetic material. They determined that a protective coat was formed around the bacteriophage, but the internal DNA is what conferred it's ability to produce progeny inside a bacterium.

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When Griffith tried to develop a cure for pneumonia he discovered transformation. By observing the effects that two types of bacteria (streptococcus pneumonia) had on mice, he saw that they had the ability to change each other. When the S type bacteria was injected into a mouse in would develop pneumonia and die. While a mouse injected with the R type would not develop pneumonia. When the S type bacteria was heat-killed then injected into a mouse the mouse would not develop pneumonia. Then again when he injected both the R type and the heat-killed S type the mouse would get pneumonia and would die. It was that discovery that led him to believe that information was transferring from one type of bacteria to the other, and that information transformed the bacteria.

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By: Jessie & Kenzie

Fredrick Griffith was a British bacteriologist, he conducted several experiments using Streptococcus pneumoniae bacteria (pneumococcal disease) and mice. While Griffith was conducting these experiments he wasn't trying to identify the genetic material he was trying to find a vaccine. He used two strands of the bacteria known as R and S. The R strand was grown in a petri dish, and formed colonies that were rough and well-defined, the R strand did not cause a sickness. The S strand made colonies that were more rounded and and smooth, because of the smooth coat it fooled the immune system and it became capable of causing disease, and later the mouse injected died from the disease.

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Rosalind Franklin was an English chemist and x ray person who made contributions to the understanding of DNA's structure. She took a photograph that gave key insight on the DNA's structure. Other scientist used her evidence to support their models and took credit for her discovery as their own. Franklin made her discovery in 1951 at the age of 31 with her student Raymond Gosling.

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By Abby
Oswald T. Avery, Maclyn McCarty, and Colin MacLeod demonstrated that DNA is the substance that causes bacetrial transformation. It was a cummulation of research in the 1930s to characterize the transformation principle The virulent strain type III-S when injected along with living but non-virulent type II-R pneumococci resulted in a deadly  infection of type III-S pneumococci.

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By Chassity and Kayleena
In 1952 Hershey and Chase did an experiment that resulted in them finding out that DNA was a genetic material. They basically grew a virus and used it to infect bacteria with radioactive sulfur. They did this to protein and DNA. This experiment demonstrated that DNA, not protein, was the genetic material because DNA was transferred to the bacteria.
https://www.youtube.com/watch?v=95eKgQxdF8w

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Watson and crick discover chemical structure of DNA - Feb 28,1953 At Cambridge university. Watson and Francis crick announce that they have determined the double -helix structure of DNA, the molecule containing human genes.

This is the Video of them

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Colin McLeod, Oswald Avery, Maclyn Mcarthy

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Colin McLeod, Oswald Avery, Maclyn Mcarthy

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By: McKenzie and Logan
started research in 1944. They began with large cultures of heat killed S cells. Enzymatically destroying other cell components for a purified substance. A heat killed S cell kills bacteria in mice. They prooved that grifiths experiment was not protein that is was DNA.

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By: Bailey and Simone
Frederick did experiments in 1928 using pneumonia and mice. He was trying to develop a vaccine against pneumonia. He used 2 strains of bacteria for this called R and S. The R strain formed colonies of related bacteria and had a rough appearance as well as it did not cause sickness when injected into the mouse. The S strain formed colonies that were rounded and smooth and had a sugar based coat which prevented bacteria from getting into the immune system of the mouse. The outcome is that the mouse got pneumonia and died.

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She lived 1920-1958 . She was born in London where she did her work. Along with Crick they used ray to see dnas 3-D structure.

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By: Kat & Katlyn

In 1953 James D. Watson and Francis H.C. Crick discovered the double-helix structure of DNA at the Cambridge University. Previous researchers had "discovered" the structure of DNA making Watson and Crank's job easier. Using their previous knowledge in physics and x-ray crystallography and the use of others experiments they discovered the structure of DNA.

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In 1952, at the Carnegie institution, Hershey and Chase studied viruses that attack bacteria, bacteriophage. They measured radioactivity in the pellet, a lump formed by heavy material, and supernatant, a liquid layer formed by a lighter material used to grow the cultures, from both of their experiments which helped them conclude that DNA was injected into host cells and it made up the genetic material of the phage.