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bio5.1

The Cell Cycle

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bio5.1

  1. 1. KEY CONCEPT Cells have distinct phases of growth, reproduction, and normal functions.
  2. 2. <ul><li>The cell cycle has four main stages. </li></ul><ul><li>The cell cycle is a regular pattern of growth, DNA replication, and cell division. </li></ul>
  3. 3. <ul><li>The main stages of the cell cycle are gap 1, synthesis, gap 2, and mitosis. </li></ul><ul><ul><li>Gap 1 (G 1 ): cell growth and normal functions </li></ul></ul><ul><li>Mitosis occurs only if the cell is large enough and the DNA undamaged. </li></ul><ul><ul><li>DNA synthesis (S): copies DNA </li></ul></ul><ul><ul><li>Gap 2 (G 2 ): additional growth </li></ul></ul><ul><ul><li>Mitosis (M): includes division of the cell nucleus (mitosis) and division of the cell cytoplasm (cytokinesis) </li></ul></ul>
  4. 4. <ul><li>Cells divide at different rates. </li></ul><ul><li>The rate of cell division varies with the need for those types of cells. </li></ul><ul><li>Some cells are unlikely to divide (G 0 ). </li></ul>
  5. 5. <ul><li>Cell size is limited. </li></ul><ul><li>Volume increases faster than surface area. </li></ul>
  6. 6. <ul><li>Surface area must allow for adequate exchange of materials. </li></ul><ul><ul><li>Cell growth is coordinated with division. </li></ul></ul><ul><ul><li>Cells that must be large have unique shapes. </li></ul></ul>

The Cell Cycle

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