Watson and Crick made use of findings from work done by Erwin Chargaff. He discovered that the proportions of the bases A, T, C and G differed between species, but within any one species: the proportion of A matched the proportion of T, and the proportion of G matched the proportion of C. Name the bases A, T, G and C.
Suggest and explain how Chargaff’s findings assisted Watson and Crick in working out the structure of DNA.
Phoebus Levene separated the nucleotides of DNA and identified the carbohydrate part of each nucleotide. State the name of this carbohydrate component.
Before the structure of DNA was discovered as the molecule of inheritance, scientists thought that proteins were the most likely molecules to carry information. Suggest how the structure of proteins made scientists think that these were the molecules that carried information.