Who discovered DNA?

Who discovered DNA?

Period: Dec 11, 1915 to Dec 11, 1990

Linus Pauling

Dec 12, 1916

Won two nobel peace prizes unshared (1954, 1962) and wrote the Linus Pauling Papers which was scientific information (1916-1986)

P.A. Levene

Dec 11, 1920

Discovered the structure of nucleotides that create DNA

Frederick Griffith

Dec 11, 1928

Studied two strains of bacteria that cause pneumonia and called one S-strain and the other R-strain

Oswald Avery

Dec 11, 1944

Identified the molecule that transformed the R-strain of bacteria into the S-strain of bacteria

Erwin Chargaff

Dec 11, 1950

Discovered the amount of guanine nearly equals the amount of cytosine and the amount of adenine nearly equals the amount of thymine within a species
Created Chargaff’s rule: C=G and T=A

Rosalind Franklin

Nov 11, 1951

Took the Photo 51 which was a picture showing DNA is a double helix, or twisted ladder shape formed by two strands of nucleotides twisted together

Watson and Crick

Dec 12, 1951

Analyzed Photo 51 based off of Chargaff’s data and Franklin’s data and built a model of the DNA and came up with the following ideas:-2 outside strands consist of alternating deoxyribose and phosphate -Cytosine and guanine bases pair to each other by three hydrogen bonds-Thymine and Adenine bases pair to each other by two hydrogen bonds

Hershey and Chase

Dec 11, 1952

Found that DNA was the changing factor from R-strain to S-strain

Maurice Wilkins

Dec 12, 1962

Took pictures of DNA and and won the Nobel Peace Prize with Watson and Crick