Quiz: Mitosis Name______________________ 1-5 Give the names of the stages of mitosis in the drawings to the left. ____________________1 ____________________2 ____________________3 ____________________4 1 2 3 4 For questions 5 - 14, give the name of the stage in which the event occurs. ____________________5 The cells begin to pinch in to divide the cytoplasm. ____________________6 The pairs of sister chromatids are lined up at the center of the cell. ____________________7 ____________________8 The chromosomes condense, thicken and become distinct from one another. The chromosomes are now visible. The chromatids are pulled to opposite sides of the cell by the microtubules. ____________________9 The nucleolus disappears during this phase. ___________________10 The nuclear membrane returns. ___________________11 The centrioles begin to move to opposite poles, organizing the microtubules as they go. The nucleolus returns and is visible. ___________________12 ___________________13 ___________________14 ___________________15 The nuclear membrane begins to break apart so that the microtubules can reach the pairs of sister chromatids. During what stage does cytokinesis occur? ___________________17 All of the information that a cell needs to function is stored in the ______ of the cell. _____ is the process by which cellular material is divided between two new daughter cells. Name given to the two new cells formed at the end of cell division. ___________________18 What must happen to all chromosomes prior to cell division? ___________________19 The name for each duplicate half of a chromosome. ___________________20 The division of the nucleus is called ____. ___________________21 The division of the cytoplasm is called ___. ___________________16 ____________________22 The result of mitosis in multicellular organisms. ____________________23 The result of mitosis in unicellular organisms. ____________________24 Sister chromatids are connected at an area called the _____. ____________________25 The _____ is the life of the cell from the time it is first formed from a dividing parent cell until its own division into two cells. The three stages of the cell cycle that lead up to cell division are? ____________________26 ____________________27 ____________________29 The cell increases its size, and manufactures extra enzymes and organelles during what phase of the cell cycle? A network or framework of fibers to which the chromosomes are attached. They push and pull the chromosomes around the cell. What cellular component makes up this framework? ____________________30 What cellular organelle organizes the construction of this framework? ____________________31 G1, S, and G2 are collectively known as what phase of the cell cycle? ____________________32 ____________________33 The cell assembles the special structures needed for cell division during what phase of the cell cycle? What happens during the “S” phase? ____________________34 This part of the cell organizes the formation of the spindle. ____________________28 35 What is the purpose of mitosis? 36 There are two main reasons why cells divide rather than continuing to grow larger and larger. What are these two reasons? 37 What happens when the controls that keep mitosis in check fail? Answers: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. telophase anaphase prophase metaphase telophase metaphase prophase anaphase prophase telophase prophase telophase prophase telophase chromosomes cell division daughter cells The chromosomes replicate. chromatid mitosis cytokinesis growth and repair asexual reproduction centromere cell cycle G1, S, G2 G1 spindle microtubules centrioles interphase G2 replication of DNA centrioles The purpose of mitosis is to produce two daughter cells that are exact duplicates of the mother cell. It is necessary that the cells be identical so that they can carry out the same function as the mother cell. 36. a) The larger a cell becomes, the more demands the cells places on its DNA. b) If the cell grows too large, it will have trouble moving enough nutrients and wastes across the cell membrane. 37. If the system of “checks and balances” fails to control the cell cycle, the cell may start dividing uncontrollably. Cancer cells do not respond to the signals that regulate the growth of cells. Cancer cells divide uncontrollably and form masses of cells called tumors.