Cancer is characterized by mutations that disrupt normal cell growth and function. The mutations change normal genes into . Cancer is characterized by mutations that disrupt normal cell growth and function. The mutations change normal genes into . enzymes oncogenes stem cells immune cells.

Cancer is basically a disease of uncontrolled cell division. Its development and progression are usually linked to a series of changes in the activity of cell cycle regulators. For example, inhibitors of the cell cycle keep cells from dividing when conditions aren’t right, so too little activity of these inhibitors can promote cancer. Similarly, positive regulators of cell division can lead to cancer if they are too active. In most cases, these changes in activity are due to mutations in the genes that encode cell cycle regulator proteins>

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answer(d) call 911;