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genetic variation
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cancer can be caused by excessive cell growth and divisick. two genes that regulate the growth and division of a cell are called
oncogenes and tumor suppressor genes. oncogenes direct cells to grow and divide, whereas tumor suppressor genes limit cell
growth and division
certain viruses have been associated with an increased risk for cancer. for example, the hepatitis b and c viruses are associated
with liver cancer, the epstein-barr virus is associated with lymphoma, and the human papilloma viruses are associated with cervical
cancer
viruses can cause mutations in their host cells. which mutation described below would be most likely to cause cancer in a host
organism?