AP BIOLOGY

Detailed explanation-1: -When cells are grown in a laboratory, which is a factor that can stop normal cells from dividing? obtaining enough food.

Detailed explanation-2: -Normal cells stop dividing when there is genetic damage or conditions are not favorable. Cancer cells continue to divide even when conditions are not appropriate.

Detailed explanation-3: -Researchers at Johns Hopkins recently learned that most cells will not divide without centrioles, and they found out why: A protein called p53, already known to prevent cell division for other reasons, also monitors centriole numbers to prevent potentially disastrous cell divisions.

Detailed explanation-4: -Senescence-in which cells stop growing and dividing-results from serious stress and genetic damage, says study coauthor Stephen Elledge, a geneticist at Harvard Medical School.

Detailed explanation-5: -Contact inhibition is a process of arresting cell growth when cells come in contact with each other. As a result, normal cells stop proliferating when they form a monolayer in a culture dish. Contact inhibition is a powerful anticancer mechanism that is lost in cancer cells (16).