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3.07 The Cell Cycle


Time to Reflect The ability of a cell to reproduce on its own is truly remarkable. The blue print for the new cell is DNA. DNA tells the cell when to grow, what to do, and when to divide. As you are reading this, your body is making thousands of new cells. Hair cells, skin cells, and new blood cells are just a few examples of cells that are being replaced. Take a moment and think why this might be so important. If you go back and look at your baby pictures, think about the vast changes you have made through the years. Incredible, isn't it? Thanks to cellular division, those changes are made. The continuation of "life" is occurring.

  • Cells have specialized jobs and they spend about 90% of their life cycle in interphase doing their special job.
  • The cell cycle has two main parts: interphase (working phase) and mitosis (dividing phase).
  • Cancer forms when a cell can not stop dividing.

Tour Debrief

To complete this activity make sure that you have:

  • added the new terms and their meanings to your Module 3 glossary page
  • watched the video on the cell cycle
  • investigated the link on skin cancer and listed some ways to prevent it from happening to you
3.07 The Cell Cycle
15 points

To complete this activity go to the assessment area and submit answers to the three questions below as the assessment for 3.07 Cell Cycle. You can copy and paste them into the comment area and complete them there, or attach a document containing the completed questions.

Submit the answers to the following questions:

  1. DNA replicates during interphase. Why is it important for a cell to have two copies of DNA before it enters the division phase, mitosis?
  2. Cancer cells can form when their DNA is changed (mutated). What are two possible environmental factors that can cause cancer?
  3. List 3 ways to reduce the development of skin cancer.

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