What does the plasma membrane of a cell consist of?
A. Protein molecules arranged in two layers with polar areas forming the outside of the membrane. B. Two layers of lipids organized with the nonpolar tails forming the interior of the membrane. C. Lipid molecules positioned between two carbohydrate layers. D. Protein molecules with polar and nonpolar tails.
Two layers of lipids organized with the nonpolar tails forming the interior of the membrane.
The plasma membrane is made up of a lipid bilayer. Remember, the prefix bi- means 2, so this literally means two layers of lipids. Each lipid has a hydrophobic tail, which is also called non-polar - meaning doesnt like water! Since cells are surrounded by water, the lipids tails face inward towards each other.