LN #15 Cancer & Cell Cycle. The Cell Cycle Interphase –Period of cell growth and DNA...

LN #15Cancer & Cell Cycle

The Cell Cycle

• Interphase– Period of cell growth

and DNA replication

• Mitosis– Period of cell division

• Prophase, metaphase, anaphase, telophase

• Cytokinesis– Cytoplasm is divided

cytokinesis

metaphase

telophase

anaphase

1 2 3 4

5 6 7

What part of the cell cycle is it?

interphasecytokinesis metaphase

anaphaseprophase prophase

telophase

What controls the normal cell cycle?

• Enzymes– Some begin the cell

cycle– Others control the cell

cycle– Others control the

cycle at every phase

• What are enzymes?– A type of protein that

speeds up chemical reactions

Video Notes:

Abnormal Cell Cycle: Cancer

• Cancer is the uncontrolled growth and division of cells.

• Cancer cells can kill an organism by crowding out normal cells, resulting in the loss of tissue function.

What Causes Cancer?

• The changes that occur in the regulation of cell growth and division of cancer cells are due to mutations.

• Various environmental factors can affect the occurrence of cancer cells.

• Genetics• Problems with enzyme production

• Some Viruses• Environmental factors

• Cigarette smoke, • air and water pollution, • UV exposure

Summary

1. What are the parts of the cell cycle?

2. What are the parts of mitosis?

3. What controls the cell cycle?

4. What is cancer?

5. How can cancer cells kill an organism?

6. What causes cancer?