of nucleotides is specified, we can examine the types of DNA structures found during replication. Specialized DNA structures are formed during the process of replication. The process of semiconservative replication illustrated in Fig. 5.3 requires that the two Working with Molecular Genetics Chapter 5, DNA Replication I, v2 2 held together by base complementarity, but it is also important because the proposed structure suggested a testable model for how a particular process occurs, in this case replication. These three models make different predictions about the behavior of the two