The approximate composition of proteins in cell membrane is
Correct Answer: 55%
Description: The cell membrane (also called the plasma membrane) envelops the cell and is a thin, pliable, elastic structure only 7.5 to 10 nanometers thick. It is composed almost entirely of proteins and lipids. The approximate composition is proteins, 55 percent; phospholipids, 25 percent; cholesterol, 13 percent; other lipids, 4 percent; and carbohydrates, 3 percent.(Ref: Guyton; 13th edition; Chapter 2 The Cell and Its Functions)
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Physiology
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