Final answer:
Proto-oncogenes are normal genes that regulate cell division, but can become oncogenes when mutated, causing uncontrolled cell growth and potential cancer. An example is the myc protein involved in Burkett's Lymphoma.
Step-by-step explanation:
Proto-oncogenes are normal genes that regulate cell division by controlling the cell cycle. They provide important signals that move the cell cycle forward, promoting DNA replication and cell division. However, when these genes mutate and become oncogenes, they can cause uncontrolled cell growth and potentially lead to cancer. An example of an oncogene is the myc protein, which is involved in Burkett's Lymphoma, a cancer of the lymph system.