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Friedrich Miescher
Miescher discovered the nucleic acids(nucleins) in the DNA, by examining the pus from infections on bandages from a local clinic. Miescher discovered the nuclein from the nucleus. He discovered the 4 elements were in the nuclein. He added to our understanding, because with his work helped shape the discovery of the nucleic acids, which is what DNA is. -
Rosalind Franklin
In 1920, Dr. Franklin, discovered that the strands of DNA was composed of phosphate on the outside of each helical structure. This discovery was made by working with a student and got two sets of high-resolution photos of crystalized DNA, seeing one was more hydrated than the other, seen using x-ray crystallography. -
Erwin Chargaff
In 1950 Erwin Chargaff contributed to DNA discovery his rule. Chargaff discovered that the percentages of adenine and thymine bases were about equal throughout any DNA sample analyzed. This is known as the Chargaff rule. Chargaff also stated about the number of pyrimidines are equal to each other as are the purines. Chargaff also expanded on base pairing, which contributed to the way DNA is analyzed and also about base pairings. -
Hershey and Chase
In 1952, Hershey and Chase used bacteria to determine that DNA is the genetic information and not proteins. The pair determined this by mixing marked viruses along with bacterial cells, injected in the protein coat and into the protein coat. They saw that the cells infected, were the ones that was put in the DNA. This added to discovery because people know where the genetic material is, and now people know more information about the genetic material -
James Watson and Francis Crick
James Watson and Francis Crick discovered the double helix model of DNA in 1953. This discovery was made by using the stick-and-ball models to test the ideas of the structure. This contribution was important, because it gave scientists an idea of how DNA looked. This depiction of DNA, has increased the discovery of the DNA and knowledge of DNA by scientists today, which is majorly beneficial. -
Meselson and Stahl
Meselson and Stahl were trying to prove or disprove Watson and Crick's hypothesis on the double helix. The pair used density gradient centrifugation, and discovered the semi conservative model and by 1957 had two experiments proving the model. The two added to our current understanding, because it explains the amount of original DNA a cell will have after reproduction.
