Use the drop-down menus below to match the scientist(s) to their contribution to the discovery of base pairings. studied the role of RNA in protein synthesis, specifically in the bacteria E. coli. created an accurate model of the structure of DNA. proposed the polynucleic model, stating that DNA and RNA were composed of nucleotides. concluded that, in DNA, adenine levels were equal to thymine levels and cytosine levels were equal to guanine levels.