![]() ![]() The mitochondrial inner membrane is made up of 76% protein and 24% lipid. Myelin, for example, is composed of 18% protein and 76% lipid. ![]() The ratios of proteins, lipids, and carbohydrates in the plasma membrane differ depending on the cell type. ![]() Protein, lipid, and carbohydrate proportions in the plasma membrane vary with age. Human red blood cells, which can be seen under a light microscope, are approximately 8 m wide, or 1,000 times wider than a plasma membrane. The thickness of plasma membranes ranges from 5 to 10 nm. The fluid mosaic model describes the plasma membrane’s structure as a mosaic of components, including phospholipids, cholesterol, proteins, and carbohydrates, that give the membrane its fluid character. Although the model has evolved slightly over time, it still best accounts for the structure and functions of the plasma membrane as we now understand them. Nicolson proposed the fluid mosaic model in 1972 to explain the structure of the plasma membrane. ![]()
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