AP BIOLOGY

Detailed explanation-1: -All normal cells (aside from stem cells) have a limited ability to divide. Cancer cells do not undergo senescence, instead, they are capable of dividing indefinitely. Cells which can divide indefinitely are termed immortal.

Detailed explanation-2: -Although cell growth is usually a continuous process, DNA is synthesized during only one phase of the cell cycle, and the replicated chromosomes are then distributed to daughter nuclei by a complex series of events preceding cell division.

Detailed explanation-3: -But some cells, such as skin cells or blood cells are dividing all the time. When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two.

Detailed explanation-4: -Normally, human cells grow and multiply (through a process called cell division) to form new cells as the body needs them. When cells grow old or become damaged, they die, and new cells take their place. Sometimes this orderly process breaks down, and abnormal or damaged cells grow and multiply when they shouldn’t.