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Miescher (1869)
Friedrich Miesher discovered and identified the nuclei in the uncle of human white blood cells. He discovered this finding when isolating and characterizing the protein components of white blood cells. During the filtration of white blood cells he came across a substance that has unusual chemical properties. This discovery added to our current understanding of DNA by better identifying was DNA is made up of. -
Chargaff (1950)
Chargaff discovered that the amount of purine is always roughly equal to the amount of pyrimidine in DNA. He also discovered that the relative amounts of adenine, thymine, guanine, and cytosine in DNA varies from one species to another. This concept is known as Chargaff's rule. He discovered this by isolating the DNA from the nucleus. this contributed to the knowledge od dan by giving a better understanding of complimentary base pairing. -
Franklin (1952)
Rosalind Franklin photographs crystallized DNA fibers. This led to a better understanding of the structure of DNA. She was able to produce two sets of high resolution photographs of DNA. She calculated the dimensions of the strands. This discovery contributed to the knowledge and understanding of DNA by actually be able to allow people the see the unknown. These photographs gave insight to how a DNA molecule looked. -
Hershey and Chase (1952)
Hershey and Chase provided further proof that genes were DNA. They discovered that DNA contained genetic material. They discovered this by growing two viruses in different isotope mediums, and then separated the virus is from the options state. Once it was separated the pellet was radioactive. This was so because the radioactive DNA was passed down through genetic DNA. This discovery added to our current understanding of DNA to show that genetic properties are passed down through genetic code. -
Watson and Crick (1953)
Watson and Crick discovered the chemical structure of DNA, is a double helix polymer, or a spiral of two DNA strands. The two spirals are held together by complementary base pairs. According to their findings, DNA replicated itself by separating into individual strands. These scientist didn't undergo the process of experimentation but used their knowledge of DNA and the research of other scientist to come to this conclusion. -
Meselson and Stahl (1958)
Meselson and Stahl proved that the semiconservative model of DNA replication was valid. They discovered DNA replication. They discovered this by labeling bacteria through differentiated isotopes.This discovery added to our current understanding of DNA by expanding on the knowledge learned on DNA.
