Cancer and the Cell Cycle Anatomy and Physiology Watch the “News alert” videos and the Cell cycle animations to answer the following questions. http://science-education.nih.gov/supplements/nih1/cancer/activities/activity2_videos.htm 1. Summarize in a single sentence the main idea of each of the News Alert videos. 2. How does a normal cell in your body become cancerous? 3. How does cancer spread? 4. Describe the “cell cycle clock”. What is the importance of the cell cycle clock in normal tissue? 5. What are proto-oncogenes? 6. What are tumor-suppresssor genes? 7. How doe proto-oncogenes and tumor suppressor genes work together? 8. What are mutagens? 9. What is the result of a proto-oncogene becoming and oncogene? 10. What is the result of a mutation in a tumor-suppressor gene? 11. Draw and label the stages of the cell cycle.