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The two sides of the plasma membrane have different lipid and protein composition. EXPLANATION: Because the membrane serves different functions on the cytoplasmic and exterior surfaces, the structure and composition of the surfaces must be different. 2 Which of the following best describes the structure of a biological membrane? two layers of phospholipids with proteins either crossing the layers or on the surface of the layers explanation:
1. Cell membranes are based on lipid bilayer. Plasma membranes consist of a lipid bilayer with proteins embedded in the bilayer. The principle lipids are phospholipids. A phospholipid molecules has a hydrophilic head with a phosphate group as part of its structure and two hydrophobic tails.his idea is called the fluid mosaic model of the cell membrane. Cell membranes are fluid in the sense that the molecules in the membrane are in constant motion. The mosaic part refers to the proteins embedded in the phospholipids.