Studying Cells Tutorial

Problem 2: Cell theory

Which of the following is not a part of the cell theory?

D.	Abnormal cells self destruct by apoptosis.
	Correct! Although this statement by itself is true, it is not part of the cell theory. Apoptosis is a mechanism for killing unnecessary or abnormal cells. For example, cells of your immune system are programmed to die after helping to fight disease. The cell theory states: all life is composed of cells, cells are the smallest form of life, and cells only arise from existing cells.