Scientist Contributions to the Discovery of DNA

Who was the first to isolate nucleic acid, called it nuclein.

• Miescher

• Levene

• Griffith

• Mendell

• Chargoff

Who discovered that there are two types of nucleic acid (DNA & RNA)

• Hershey & Chase

• Avery, MacLeod & McCarthy

• Griffith

• Levene

Who described the Transforming Principle - that diseased genes can be spread to healthy individuals

• Miescher

• Griffiths

• Watson & Crick

• Chargaff

Who explained the Transforming Principle using DNA as agent of the disease

• Levene

• Franklin & Wilkins

• Avery, MacLeod & McCarthy

• Hershey & Chase

• Griffith

Who discovered that the proportion of A is same as T and proportion of G is same as C in DNA

• Chargaff

• Hersey & Chase

• Avery, MacLeod & McCarthy

• Miescher

Who showed that DNA and not proteins were the genetic material?

• Griffith

• Avery, MacLeod & McCarthy

• Franklin & Wilkins

• Hersey & Chase

Who used X-Ray crystallography to see DNA structure?

• Franklin & Wilkins

• Watson & Crick

• Hershey & Chase

• Avery, MacLeod & McCarthy

Who discovered discovered the helical structure of DNA and that bases were on the inside and sugar phosphates on the outside?

• Griffith

• Levene

• Watson & Crick

• Franklin & Wilson

Who produced a structural model of the double helix?

• Watson & Crick

• Franklin & Wilkins

• Miescher

• Mendell

Who described the 3 components of DNA & RNA as sugar, phosphate group & nitrogenous bases?

• Hersey & Chase

• Levene

• Mendell

• Griffith