AP BIOLOGY

Detailed explanation-1: -The plasma membrane is a biological membrane that surrounds all live cells and serves to separate internal and external components. It protects the cell from a variety of external stresses and chemicals.

Detailed explanation-2: -The plasma membrane, also called the cell membrane, is the membrane found in all cells that separates the interior of the cell from the outside environment. In bacterial and plant cells, a cell wall is attached to the plasma membrane on its outside surface.

Detailed explanation-3: -The principal components of the plasma membrane are lipids (phospholipids and cholesterol), proteins, and carbohydrate groups that are attached to some of the lipids and proteins.

Detailed explanation-4: -The cell membrane consists of three classes of amphipathic lipids: phospholipids, glycolipids, and sterols. The amount of each depends upon the type of cell, but in the majority of cases phospholipids are the most abundant, often contributing for over 50% of all lipids in plasma membranes.