In this activity, students will use an HHMI Biointeractive module to review the eukaryotic cell cycle, key players that regulate the cycle, and applications to cancer. The first part of the activity focuses on going through the module and drawing out the key cell cycle regulators on to a figure of the cell cycle. The second part of the recitation has the students interpret a graph depicting the changes of cyclin and CDK levels through out the stages of the cell cycle. The student then needs to apply information from the interactive module and the graph to questions about cancer. This activity will help students visualize cell cycle check points and build upon the regulation mechanisms to figure out how dysfunctions may lead to cancerous cells.