1 / 18

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.

Audrey
Télécharger la présentation

Cell Cycle

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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?

More Related