INTRODUCTION
This activity explores the research shown in the short film "The Double Helix," which tells the story of how DNA's structure was discovered.
Watson and Crick first built a double helix model of DNA. In this model, the nitrogenous bases were on the inside of the DNA molecule, and the phosphate groups were on the outside.
At that time, why did it seem reasonable for the bases to be on the inside of the DNA molecule?
What evidence caused Watson and Crick to revise this model? Give specific examples from the film.