Cell membranes consist of a lipid bilayer

Cell membranes
Cell membranes 

Cell membranes consist of a lipid bilayer and associated proteins and carbohydrates. In the bilayer, the hydrophilic portions of the lipids are arranged on the external and cytosolic surfaces, and the hydrophobic tails are located in the interior. Transmembrane proteins are anchored to the core of the bilayer by their hydrophobic regions and can be removed only by detergents that disrupt the bilayer. Peripheral membrane proteins are attached to the surface of the membrane by weak electrostatic forces and are easy to remove by altering the pH or ionic strength of their environment.

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