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Skin Cancer Module: Practice Exercises

Skin Cancer: Module 3
Cancer Biology Exercises

Back to Module 3

Question 1
Cells double in number each time they divide. How many times must a cell divide to produce 100,000 cells?

After 16 divisions, there will be 65,536 cells; after 17 divisions there will be 131,072 cells.


Question 2
Give two reasons why cells normally divide.

Growth of an organism and repair of tissue.


Question 3
Which part of the cell controls cell division?

The nucleus, specifically the DNA in the nucleus.


Question 4
What can happen if this part of the cell is damaged?

Mutation can cause cell division to become unchecked, causing cancer.


Question 5
How is a cancer cell different from a normal cell?

A cancer cell's rate of division is not controlled. This leads to tumor formation and cancer.


Question 6
Explain the difference between a benign tumor and a malignant tumor.

Benign tumors have a boundary and do not spread. Malignant tumors may spread to other areas of the body.


Question 7
How can cancer cells spread throughout the body?

Cells from the tumor can separate and enter the blood or lymph. They are carried to other parts of the body where they may start dividing, forming secondary tumors.


True or False

Question 8
The purpose of cell division is for growth and tissue repair.



Question 9
The mitochondria controls cell division.

False: Cell division is controlled by the nucleus.


Question 10
Abnormally fast cell growth is called cancer.



Question 11
A tumor that does not spread is termed "malignant."

False: A tumor that does not spread is benign.


Question 12
An antigen is a substance that causes cancer.

False: A carcinogen is a substance that causes cancer.


Question 13
Too much exposure to sunlight can cause skin cancer.


Back to Module 3

This page last reviewed August 27, 2004

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