1. Which of the following is a characteristic of a benign tumor? A. It invades surrounding tissues.

B. It causes pain when it presses on a nerve.

C. It is surrounded by a capsule.

D. It is harmless.

2. What is meant by cell differentiation?

A. It refers to the damage to genetic material that causes cancer.

B. It refers to the ability of cancer cells to spread.

C. It refers to the way different types of cells look and function.

D. It refers to the way cancer cells differ from normal cells.

3. Which of the following is NOT an environmental factor that causes cancer?

A. radiation

B. humanpapilloma virus (HPV)

C. a mutation in the BRCA1 gene

D. certain drugs or chemicals

4. What is TRUE about normal cells?

A. Normal cells do not function appropriately in the tissue or organ they are a part of.

B. Normal cells do not move from one organ or body system to another.

C. Normal cells do not obey genetic instructions to stop growing and dividing.

D. Normal cells contain damaged genetic material.