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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:
Introduction The purpose of a biological membrane is to control the internal environment of a cell. A cell can be surrounded by millions of molecules at any given time, and it is up to the membrane to control what enters and what leaves a cell. Water is the single most important molecule in any living system.