1. Control of Cell Cycle and Cancer Notes

2. What factors initiate and control cell division?

3. Normal Control of the Cell Cycle
Enzymes work to monitor a cell’s progress from phase to phase during the cell cycle
Some enzymes work to replicate DNA, some begin cell division, and others control the rest of the cell cycle

4. Each chromosome contains thousands of genes

5. Cancer: A Mistake in the Cell Cycle
Cancer is the result of uncontrolled cell division caused by genetic and environmental factors
Uncontrolled cell division occurs when:
Cells fail to produce certain enzymes
Enzymes are overproduced
Enzymes are produced at the wrong time

6. Stages of Cancer
Cancerous cells result from a change in one or more genes
Form masses of tissues called tumors that deprive normal cells of nutrients
Later cancer can enter the circulatory system and spread throughout the body