This is a great review worksheet for an AP Biology class reviewing early experiments that led to our current knowledge of molecular biology. It includes a student chart with an answer key that provides information on Morgan, Griffith, Hershey and Chase, Chargaff, Watson and Crick, Meselson and Stalh, and Beadle and Tatum. Students research (or obtain from text/internet), the main question the researchers were trying to answer, the organisms they used, the laboratory techniques, and the conclusions. The answer key provides a simple outline of the experiments with bullet points that students should remember. This addresses the AP curriculum learning objective 3.2: "The student is able to justify the selection of data from historical investigations that support the claim that DNA is the source of heritable information."