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Biology October 3-4 Test Debrief Osmosis lab debrief Mitosis HW: Study TX pgs. 250 – 252

Biology October 3-4 Test Debrief Osmosis lab debrief Mitosis HW: Study TX pgs. 250 – 252 Do 1-8 on SG 269 Do 1-15 on SG 270. MITOSIS. Cell Growth and Division. 2. Why do cells divide?. If the cell is too big: Too much demand is placed DNA

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Biology October 3-4 Test Debrief Osmosis lab debrief Mitosis HW: Study TX pgs. 250 – 252

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  1. Biology October 3-4 • Test Debrief • Osmosis lab debrief • Mitosis • HW: Study TX pgs. • 250 – 252 • Do 1-8 on SG 269 • Do 1-15 on SG 270

  2. MITOSIS Cell Growth and Division

  3. 2. Why do cells divide? • If the cell is too big: • Too much demand is placed DNA • Harder to move enough nutrients and wastes across the cell membrane

  4. Surface area vs. volume

  5. 4. Surface Area vs. Volume • As a cell increases in size, volume increases faster than surface area • This causes the ratio of surface area to volume to decrease. • This is a serious problem for the cell and is why the cell cannot grow any larger than it does.

  6. 5. Cell division solves those problems • Before a cell becomes too large, a growing cell replicates its DNA and then divides into two new “daughter” cells. This is called mitosis.

  7. Cell Cycle • http://www.cellsalive.com/mitosis.htm • http://www.johnkyrk.com/mitosis.html

  8. Mitosis versus Meiosis Foldable

  9. Main Events of a Cell Cycle • Interphase • G1, • G2, • G3 • M Phase • Prophase • Metaphase • Anaphase • Telophase • http://www.cellsalive.com/mitosis.htm

  10. Interphase • The cell grows and replicates its DNA • Chromosomes are not visible, only chromatin

  11. Prophase • Chromatin condenses into chromosomes • Centrioles separate • Nuclear envelope breaks down

  12. Metaphase • Chromosomes line up across the center of the cell

  13. Anaphase • Chromosomes are pulled apart by spindle into individual chromatids

  14. Telophase • Chromosomes gather at opposite ends of the cell • Two new nuclear envelopes form

  15. http://www.johnkyrk.com/mitosis.html Cytokinesis • The cytoplasm pinches in half • Plants lay down a cell plate • Two new cells now exist.

  16. Label the stages #7

  17. What stops cell from growing? • Proximity to neighbor cells. • Cells in a petri dish will continue to grow until they come into contact with other cells. • Similarily, skin around a wound.

  18. Which chemicals regulate the cell cycle?

  19. How do cells respond to contact with other cells?

  20. How are cancer cells different from other cells?

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