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Frederick Griffith
Griffith discovers that a factor in heat-killed, disease-causing bacteria can "transform" harmless bacteria into ones that cause disease. -
Oswald Avery
Avery's team determines that genes are composed of DNA. -
Erwin Chargaff
He isolated DNA from different organisms and measured the levels of each four nitrogenous bases. -
Linus Pauling & Robert Corey
Pauling and Corey determine that the structure of a class of proteins is a helix. -
Rosalind Franklin
Franklin studies the DNA molecule using a technique called X-ray diffraction. -
Alfred Hershey & Martha Chase
They discovered DNA was comprised of genetic material -
James Watson & Francis Crick
Watson and Crick develop the double-helix model of the structure of DNA.
