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Cell Cycle

Cell Cycle. Cell Growth and Division. 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. Surface area vs. volume. 4. Surface Area vs. Volume.

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Cell Cycle

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  1. Cell Cycle Cell Growth and Division

  2. 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

  3. Surface area vs. volume

  4. 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.

  5. 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.

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

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

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

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

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

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

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

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

  14. Label the stages #7

  15. 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.

  16. Which chemicals regulate the cell cycle?

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

  18. How are cancer cells different from other cells?

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