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Frederick Grifith
Frederick discovered that genetic information could be transfered from dead bacterial cells to live ones through a process that he called transformation. He showed this through an experiment using rodents and pneumonia and he discovered that the rodents that were immune gave their immunity to another one through "transformation" -
Phoebus Levene
Phoebus Levene discovered the components of DNA. He beleived these components were linked together by 4 units per molecule of what he called nucleotides ( adenine, guanine, thymine, cytosine, and deoxyribose) -
Oswald Avery
Oswald Avery stated that DNA was most likely the substance that held the hereditary material, previously known as the "transforming principle" -
Erwin Chargaff
Erwin Chargaff made two discoveries, or rules, about DNA. The first rule was that in DNA the number of guanine units is the same as the number of cytosine units and the number of adenine units is the same as the number thymine units. The second thing he discovered was that the composition of DNA varies between species, especially in the amount of nucleotides -
Hershey and Chase
They put viruses in a blender to seperate the protein coating from the nuclei to show that it was the acid that caused the transmission of genetic information, not the protein.Through their experiments, they discovered that DNA was where the hereditary material was stored -
Rosalind Franklin
Rosalind Franklin used x-rays to discover what DNA looked like. She did this by shooting x-rays at molecules and looking at the diffraction patterns from it, then recreating what the patterns looked like to make an accurate model of the DNA -
Watson and Crick
With the help of Rosalind Franklin and a few other scientists, Watson and Crick discovered the double-helix structure of DNA. This is still the accepted model today and their discoveries revolutionized how DNA is looked at. -
Linus Pauling
Linus Pauling helped lead to the discover of the double helix structure of DNA. Although at the time he thought DNA had a three-helical structure, which turned out to be wrong, his ideas about the structure spurred other scientists research efforts. -
Maurice Wilkins
Maurice Wilkins used X-ray crystallography to show the structure of nucleic acid, which backed up Crick and Watsons' research about the double-helix structure of the nucleic acid
