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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?
Answer
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.
Answer
Growth of an
organism and repair of tissue.
Question 3
Which part of the
cell controls cell division?
Answer
The nucleus,
specifically the DNA in the nucleus.
Question 4
What can happen if
this part of the cell is damaged?
Answer
Mutation can cause
cell division to become unchecked, causing cancer.
Question 5
How is a cancer cell
different from a normal cell?
Answer
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.
Answer
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?
Answer
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.
Answer
True
Question 9
The mitochondria
controls cell division.
Answer
False: Cell division is controlled by the nucleus.
Question 10
Abnormally fast cell
growth is called cancer.
Answer
True
Question 11
A tumor that does
not spread is termed "malignant."
Answer
False: A tumor that does not spread is benign.
Question 12
An antigen is a
substance that causes cancer.
Answer
False: A carcinogen is a substance that causes cancer.
Question 13
Too much exposure to
sunlight can cause skin cancer.
Answer
True
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