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 the 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
The correct answer is that the fluid mosaic model of the cell membrane was proposed by Singer and Nicolson. This model illustrates the cell membrane as a flexible and dynamic structure, comprised of a lipid bilayer with proteins embedded within it, which allows for the fluidity necessary for various cellular functions. Option A is incorrect because the transport of Na+ and K+ ions primarily involves active transport, not passive transport. Option B is misleading since proteins constitute about 50 to 60% of the membrane, not 60 to 70%. Option C is also incorrect because the arrangement of lipids in a bilayer has polar heads facing outward, towards the extracellular and cytoplasmic environments, not inward.
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