In this module, students explore how DNA’s structure enables it to carry genetic information and copy itself before cell division. Students use a digital interactive to investigate the molecular structure of DNA, then build and replicate a paper model to visualize base-pairing rules and the semi-conservative process of DNA replication. The module emphasizes the relationship between molecular structure and function, showing how the shape and pairing rules of DNA make accurate replication possible. Students will learn that accurate DNA replication is essential for passing genetic information from one cell to the next.