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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:
The lipid bilayer, therefore, is not a continuous layer, but contains non-lipid molecules, in particular proteins. The significance of the model The fluid mosaic model is the only accepted proper description of a biological membrane.Its publication in 1972 by Singer and Nicolson (Science 1972 Feb. 18 175:23 720-31) put an end to other existing and competing models of biological membranes.he functional characterization of ion channels in biological membranes has proven the fluid mosaic model correct. The model has become a scientific fact. It has become a fact, even though nobody has ever observed the activity of Gramicidin at this single molecule level in a real cell, a bacterial membrane.