Homework: The above sketch of the Watson-Crick model of DNA was included in a 1953 letter from James Watson to his teacher, Max Delbrück.
1. Print a copy of the sketch. Using it as a model, draw a pair of accurate models of the T / A and C / G pairs: label carbon, nitrogen & oxygen atoms, identify single- and double-bonds, etc.
2. Watson's sketch contains at least one fundamental error: identify and correct it.