Question

1. a normal gene of a man mutates to become a(an) ____________, a cancer - causing gene.
2. the man is exposed to a(an) ____________, a cancer - causing agent in the environment.
3. a mass of tissue, called a(an) ____________, grows in the man’s lungs.
4. the tumor cells spread from the lungs to other parts of the body, a process called
5. the man feels ill and goes to a physician, who has a surgeon perform a(an) ____________, the removal of a small piece of tissue for examination.
6. examination of the biopsy confirms a diagnosis that the man has ____________, a disease that involves the rapid, uncontrolled growth and spread of abnormal cells.

Explanation:

1. A normal gene mutating to a cancer - causing gene is a proto - oncogene mutating to an oncogene. So the answer is oncogene.
2. A cancer - causing agent in the environment is a carcinogen. So the answer is carcinogen.
3. A mass of tissue related to cancer is a tumor. So the answer is tumor.
4. The spread of tumor cells from one part to another is metastasis. So the answer is metastasis.
5. The removal of a small piece of tissue for examination is a biopsy. So the answer is biopsy.
6. A disease with rapid, uncontrolled growth of abnormal cells is cancer. So the answer is cancer.

Answer:

1. oncogene
2. carcinogen
3. tumor
4. metastasis
5. biopsy
6. cancer