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Select the correct statement from the following regarding cell membrane.

1. Na+ and K+ ions move across cell membrane by passive transport
2. Proteins make up 60 to 70% of the cell membrane.
3. Lipids are arranged in a bilayer with polar heads towards the inner part.
4. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Correct answer: Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Solution

The fluid mosaic model is the accepted description of membrane structure, and it was proposed by Singer and Nicolson. The other options are incorrect because Na+ and K+ typically require active transport, membrane lipids have hydrophilic heads facing outward, and proteins do not generally constitute 60–70% of the membrane.

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