Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

Exercise 1

Meselson and Stahl Revisited. For each of the alternative models of DNA replication shown in Figure 17-3, use a sketch to indicate the distribution of DNA bands that Meselson and Stahl would have found in their cesium chloride gradients after one and two rounds of replication.