EVERYDAY SCIENCE

Detailed explanation-1: -Like all other cellular membranes, the plasma membrane consists of both lipids and proteins. The fundamental structure of the membrane is the phospholipid bilayer, which forms a stable barrier between two aqueous compartments.

Detailed explanation-2: -One is to transport nutrients into the cell and also to transport toxic substances out of the cell. Another is that the membrane of the cell, which would be the plasma membrane, will have proteins on it which interact with other cells.

Detailed explanation-3: -Cell membranes act as a barrier and gatekeeper between two distinct areas. Due to their semi-permeable nature, only a small number of molecules may penetrate the lipid bilayer. Gas and small hydrophobic molecules, such as oxygen and and carbon dioxide can quickly pass through membranes.

Detailed explanation-4: -In its role as gatekeeper, the cell membrane regulates molecular traffic into and out of the cell via specialized membrane proteins.