Baixa (8)

DNA

By veronica_virolai

  • Discovery of nucleic Acids

    Discovery of nucleic Acids
    Isolated the genetic material from white blood cell nuclei. He noted it had a acidic nature and called it nuclein.
    Friedrich Miescher (1844 - 1895)

  • Levene's Tetranucleotide

    Levene's Tetranucleotide
    It was thought to be organized in tetrads, with four nucleotides per molecule, thus creating a simple structure. But unfortunately Levene was wrong.

  • Frederick Griffith

    Frederick Griffith
    He was a bacteriologist who studied two strains of streptococci that caused pneumonia and was the first to demonstrate bacterial transformation.

  • Avery, MacLeod and, McCarty

    Avery, MacLeod and, McCarty
    They explained the results of Frederick Griffith's findings. It was determined that what actually caused the transformation and they transformed it by mixing it with some enzymes.

  • Double Helix?

    Double Helix?
    Watson and Crick created the first model of DNA and described it as a double helix structure with sugars and phosphates in the center and nucleobases on the outside, although it turned out to be incorrect.

  • Counting nucleobases

    Counting nucleobases
    He was interested in the percentages of the different nucleobases and noticed something very strange creating chargaff's rules.

  • Hersey-chase Experiments

    Hersey-chase Experiments
    What they did was to use a bacterial cell and then they took bacteriophages labeled in a certain way.
    They came to the conclusion that it was the DNA and not the protein that was the genetic material and the protein served as a packaging, basically, to cover it. The genetic material is what infects the bacteria.

  • Rosalind Franklin Photo 51

    Rosalind Franklin Photo 51
    She was an X-ray crystallographer, she took amazing pictures of the B form of DNA, she figured out how to see the wet form, the form that exists in cells.