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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:
Plasma membrane is also a phospholipid bilayer which is essentially a biomembrane that can cover a cell or a cell organelle. For example, lysosome is a cell organelle which contains hydrolytic enzymes and it is bound by a single layer of plasma membrane. While, mitochondria, the powerhouse of the cell is bound by two layers of plasma membrane. Even the nucleus is membrane bound in eukaryotic cells. Hope that helps.