Download The Life and Death of Skin Cells

The Life and Death of Skin Cells
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How many skin cells do you lose every minute? _________________________________.
What is the mass of dead cells that we shed over a day? __________________________.
What is the mass of dead cells that we shed over a year? _________________________.
Why doesn’t our skin just wear away?
5. In a young person, how long does it take for skin cells to mature?
6. Why is it good to have those old cells on the surface?
7. What are three things that might affect the time it takes to replace skin cells?
8. What is the best way to keep skin healthy?
9. What are three affects of UV rays on the skin?
10. What are three ways that we can protect our skin?
The Cell Cycle
1. What is the main goal of the cell cycle?
2. What does the cell spend most of its time doing?
3. What is the phase called when it is preparing for cell division?
4. What is the process of cell division called?
5. Copy Figure 1.28 into the space below:
6. How many chromosomes does a typical human have? ________________________.
7. What are sister chromatids?
8. Why is there a limit to how big a cell can become?
9. Know the basic difference between the three phases of interphase:
a. First Growth Phase:
b. Synthesis Phase:
c. Second Growth Phase:
Cell Growth and Repair
1. Different cells undergo _______________ and _______________ at different rates.
_______________________ do not undergo ________________ once they mature. Skin cells
and cells in the _____________________ undergo mitosis __________________.
2. In a growing organism mitosis occurs the most in areas of ___________________.
3. Intestinal cells divide every ________________ because they are broken down by the
_____________________. Red blood cells last for __________________________.
Factors that affect mitosis
1. A change in altitude would cause the rate of mitosis in your blood cells to _______________.
2. How does light affect mitosis in a plant?
3. What can be the affect of antibiotics on mitosis in bacteria?
Cancer Cells
A cell that divides _______________________ is called a cancer cell. Cancer cells develop when a
change occurs in the cell that affects how _______________________. When a cell’s __________
changes it is known as a __________________. Some _______________ and environmental agents,
such as _____________________ can cause cell mutations. Some cancer causing mutations are
___________________.
Copy out Table 1.4 on page 34 to show the four differences between cancer cells and normal cells.
Normal Cells
Complete Quick Lab A9 on page 36.
Cancer Cells
10. Copy out the 6 phases of mitosis and give a brief description: