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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 Other molecules are also found in the membrane. 2  For example, other lipids, such as cholesterol, may be present. 3  Many proteins are found in the membrane, or else are attached to lipids in the membrane. 4  The lipids, proteins, and other molecules found in biological membranes can freely move laterally (sideways). The hydrophobic ends face each other on the inside, and the hydrophilic ends are on the outsides of the membrane. 2  That way, the hydrophobic regions do not interact with water, and the hydrophilic regions do. 3  Both parts of each phospholipid molecule are happy.. 4  Other molecules are also found in the membrane.