This is the third unit of the class. We cover DNA and RNA structure, replication and expression of the genetic material, bacterial genetics and viruses (a short intro). To start, pick a subunit and the side bar to the left will be populated with topics that you can review. This guide works best if yo have your notes and your textbook with you. You will also need some paper to write things down. Writing things down in your own words is an excellent way to make sense of complicated topics.