Chapter 10, section 1 cell division
- 1. Chapter 10, Section 1
- 2. Why is cell division important for many celled organisms and one celled organisms? Many celled organisms grow because cell division increases total number of cells One celled organisms need cell division because it’s how they reproduce themselves.
- 3. Why is cell division important even after growth stops? It’s how our bodies repair and replace what is needed. (red blood cells)
- 4. What is the cell cycle? A series of events that takes place from one cell division to the next.
- 5. How long does the cell cycle take? It is not the same in all cells.
- 6. Why do skin and bone cells constantly repeat the cycle? Because these cells are needed for repair, growth and replacement.
- 7. What is interphase? A period of growth and development
- 8. How does interphase relate to eukaryotic cells? A eukaryotic cell has a nucleus which is needed for cell division. Cells with a nucleus spend most of their time in interphase.
- 9. Why are muscle and nerve cells always in interphase? They are cells that no longer divide.
- 10. What is happening during interphase for an actively dividing cell? The cell copies its hereditary material and prepares for cell division during interphase.
- 11. What happens to hereditary material before a cell divides? The hereditary material is copied.
- 12. What happens after interphase? After interphase, cell division begins.
- 13. What is mitosis? The process in which the NUCLEUS divides to form two identical nuclei.
- 14. What are the steps of mitosis? Briefly describe what is happening in each phase. Prophase—The chromatid pairs are now visible and the spindle is beginning to form. Metaphase—Chromatid pairs are lined up in the middle of the cell. Anaphase—The chromosomes have separated. Telophase—The cytoplasm is beginning to separate.
- 15. What is the difference in mitosis between plant and animal cells? In plant cells, the appearance of a cell plate tells you that the cytoplasm is being divided. (because of cell wall)
- 16. • Following the division of the cytoplasm, most new cells…… Begin the period of growth, or interphase. P. 278