Chapter 13 (DNA): Scientists

Found that hydrogen bonds could form between certain nitrogenous bases

• Watson & Crick

• Hershey & Chase

• Franklin

• Chargaff

Wanted to discover how bacteria made people sick

• Griffith

• Avery

• Franklin

• Hershey & Chase

Used the technique called X-ray diffraction to capture the first picture of a DNA molecule

• Franklin

• Watson & Crick

• Avery

• Hershey & Chase

Wanted to determine which part of the virus (protein coat or DNA core) entered a bacterial cell

• Hershey & Chase

• Watson & Crick

• Avery

• Chargaff

Discovered that nucleic acid was the transforming factor in the bacterial transformation process

• Avery

• Griffith

• Franklin

• Hershey & Chase

Isolated two strains of bacteria onto petri plates: R strain and S strain

• Griffith

• Watson & Crick

• Avery

• Franklin

Found that the percentages of A=T and C=G in each and every organism

• Chargaff

• Avery

• Franklin

• Griffith

Discovered that DNA was a double helix and composed of two strands

• Watson & Crick

• Franklin

• Hershey & Chase

• Chargaff

Worked with certain types of bacteria to understand how pneumonia was produced

• Griffith

• Pasteur

• Koch

• Fleming

Built the first 3-dimensional working model of DNA and won a Nobel Prize

• Watson & Crick

• Hershey & Chase

• Avery

• Franklin