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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:
Like all biological membranes, the cell membrane consists of a fluid phospholipid bilayer containing proteins and other molecules. Biological membranes are selectively permeable, which means that although some molecules can diffuse across the membrane, many molecules cannot. Biological membranes are. , 2  which means that although some molecules can diffuse across the membrane, many molecules cannot. 3  This means that the cell membrane can form a barrier-keeping some molecules, such as poisons, OUTSIDE the cell, and keeping other molecules, such as nutrients, INSIDE the cell.