Select the correct statement from the following regarding the cell membrane.
Correct answer: D. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.
- A. Na+ and K+ ions move across cell membrane by passive transport.
- B. Proteins make up 60 to 70% of the cell membrane.
- C. Lipids are arranged in a bilayer with polar heads towards the inner part.
- D. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.
Explanation
According to the fluid mosaic model of cell membrane structure proposed by Singer and Nicolson (1972), the plasma membrane contains about 60-80% proteins and 20-40% lipids. Lipids form a bilayer with hydrophilic heads pointing outwards. The cell membrane allows transport of some molecules by passive transport e.g., water, neutral solutes while some are transported actively e.g., Na+ /K + pump.
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