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Cell Growth and Division: Understanding How Organisms Grow and the Causes of Cancer

Explore the process of cell growth and division, learn about the main events of the cell cycle and the phases of mitosis. Understand the limits to cell growth and how DNA overload and material exchange affect cell division. Discover the causes and effects of cancer and the importance of understanding your family's medical history.

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Cell Growth and Division: Understanding How Organisms Grow and the Causes of Cancer

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  1. Announcements Poster Extra Credit Due Friday Ch.8 Test Corrections – Friday Ch. 9 Test Correction – Next Wednesday

  2. Ch. 10Cell Growth and Division How do organisms grow? How does the same copy of DNA get in each cell? What is cancer?

  3. Do organisms grow because A. cells are getting larger B. number of cells increases?

  4. Microscope Slides of plants Ranununculus Stem Basswood

  5. Why don’t cells continue to grow?

  6. Limits to Cell Growth • DNA “Overload” – The larger the cell, the more demand for DNA

  7. Limits to Cell Growth • Material Exchange – The larger the cell, the lower the surface area to volume ratio. -Not enough surface area (cell membrane) to supply the demand (volume) of the cell.

  8. Cell Division Cell divides into two new daughter cells

  9. Ch. 10 Vocab Due Tomorrow

  10. Ch. 10 Goals • 1. What problems do growth cause for cells? • 2. What are the main events of the cell cycle? • 3. What are the four phases of mitosis?

  11. 10-2 Cell Division • Cell division has two stages • 1. Mitosis – Division of the nucleus • 2. Cytokinesis – Division of the cytoplasm

  12. Binary Fission 1 chromosome attached to the cell membrane Chromosome is copied Cell doubles in size Cell divides into 2 cells

  13. http://www.youtube.com/watch?v=gEwzDydciWc&feature=related

  14. Only visible during cell division Made of DNA and Proteins http://www.youtube.com/watch?v=N5zFOScowqo

  15. Chromatids • Before cell division the chromosome is replicated. • Each chromosome consists of two identical “sister” chromatids • Centromere – where chromatids are attached

  16. - Repeating set of events cells go through as they divide.

  17. When a cell is not in cell division it is in Interphase. • 1. G1 phase – • 2. S phase – • 3. G2 Phase –

  18. 1. What are two reasons why cells have to divide? • The repeating set of events a cell goes through as it divides is the ______________. • What three things does a new cell have to do before it can divide?

  19. You need 4 different colors colored pencils

  20. http://www.cellsalive.com/mitosis.htm

  21. 1. Study Guide Today Tue – Family history discussion - Lab Wed – Ch. 10 Quiz – Vocab and Mitosis stages Thur – Half Day Friday – Ch. 10 Test

  22. Eukaryotic Cell Division • Cell division has two stages • 1. Mitosis - nucleus • 2. Cytokinesis - cytoplasm • Result of mitosis • 2 daughter cells • 46 chromosomes each

  23. The division of the cytoplasm

  24. 10-3 Regulating the Cell Cycle • Facts about cell division • 1. Not all cells go through cell division. • 2. replace cells that wear out or break down.

  25. Controls on Cell Division • Experiment on cell division 1. Place cells in a petri dish with nutrient broth. 2. Cells will grow until they fill the dish 3. Remove a strip of cells in the middle 4. Cells will grow again to fill empty space What does that resemble on your body?

  26. Cell Cycle Regulators • Cyclins – proteins that regulate the timing of the cell cycle in eukaryotic cells. • Note – Dozens of other proteins had been found since then. http://www.pearsonsuccessnet.com/snpapp/iText/products/0-13-203512-X/ch10/sb4502f1.html

  27. Internal Regulators • Only allow the cell to proceed only when certain processes have happened inside the cell. • Example – waiting for chromosomes to be replicated.

  28. External Regulators • Direct cells to speed up or slow down the cell cycle. • Example – wound healing

  29. Uncontrolled Cell Growth • Cancer – disorder in which some of the body’s own cells lose the ability to control growth. • Cancer cells do not respond to triggers to stop cell division.

  30. Vocab Quiz FridayCancer VideoStart finding out family history

  31. http://www.ted.com/talks/william_li.html

  32. Announcements Today – Class discussion over family history - Observe mitosis under a microscope - Have notes out Wed – Ch. 10 Vocab / Cell Division / Mitosis Thur – Short day Fri – Ch. 10 Test

  33. Quick Quiz Identify the stage of mitosis.

  34. Quick Quiz Identify the stage of mitosis.

  35. Quick Quiz Identify the stage of mitosis.

  36. Quick Quiz Identify the stage of mitosis.

  37. What is cancer? The body’s own cells lose the ability to control growth.

  38. What are the main causes of cancer?

  39. Can we eat to starve cancer? www.eattodefeat.org/ Dr. William Li Should you leave your life in only the hands of your doctors?

  40. Your family medical history Why is it important to understand your families medical history? Which reason do you feel is the most important?

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