1. Chapter 4 Cell Processes and Energy What events take place during the three states of the cell cycle? How does the structure of DNA help account for the way in which DNA copies itself? Section 3: Cell Division

2. Chapter 4 Cell Processes and Energy The Cell Cycle

3. Chapter 4 Cell Processes and Energy Mitosis During mitosis, the cell’s nucleus divides into two new nuclei. One copy of the DNA is distributed into each of the two daughter cells.

4. Chapter 4 Cell Processes and Energy Cell Cycle Activity – Flip Notes Click the Active Art button to open a browser window and access Active Art about the cell cycle.

5. Chapter 4 Cell Processes and Energy Length of the Cell Cycle How long does it take for a cell to go through one cell cycle? It all depends on the cell. A human liver cell, for example, completes one cell cycle in about 22 hours, as shown in the graph. Study the graph and then answer the following questions.

6. Chapter 4 Cell Processes and Energy Length of the Cell Cycle The longest curved arrow represents the cell’s interphase; the shortest represents cytokinesis; and the middle one represents mitosis. Reading Graphs: What do the three curved arrows outside the circle represent?

7. Chapter 4 Cell Processes and Energy Length of the Cell Cycle Interphase Reading Graphs: In what stage of the cell cycle is the wedge representing growth?

8. Chapter 4 Cell Processes and Energy Length of the Cell Cycle 10 hours Interpreting Data: In human liver cells, how long does it take DNA replication to occur?

9. Chapter 4 Cell Processes and Energy Length of the Cell Cycle Interphase Drawing Conclusions: In human liver cells, what stage in the cell cycle takes the longest time?

10. Chapter 4 Cell Processes and Energy Structure of DNA The DNA molecule, supported by proteins, is shaped like a twisted ladder.

11. Chapter 4 Cell Processes and Energy Replication of DNA Because of the way in which the nitrogen bases pair with one another, the order of the bases in each new DNA molecule exactly matches the order in the original DNA molecule.

12. Chapter 4 Cell Processes and Energy Video - Cell Cycle: Mitosis and Cytoplasmic Division