1. 10.3 Regulating the Cell Cycle
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2. Q: How is the cell cycle regulated?
A: The cell cycle is controlled by regulatory proteins both inside & outside the cell.

3. Regulatory Proteins Internal regulators External regulators
Cyclin-regulates the timing of the cell cycle.
Normally, when cells touch, they stop growing.
Growth factors-one of a group of external regulatory proteins that stimulate the growth and division of cells.

4. Apoptosis-Process of programmed cell death.

5. Cancer: Uncontrolled Cell Growth p53 gene
Q: How do cancer cells differ from other cells?
A: Cancer cells do not respond to the signals that regulate the growth of most cells. As a result, the cells divide uncontrollably.

6. Cancer: Uncontrolled Cell Growth
Cancer-does not respond to the signals that regulate the growth of most cells.
Tumor-mass of cancer cells.
Caused by defects in the genes that regulate cell growth & division
(p53 gene).

7. WB p
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