[Fluid mosaic model of cel...] Select the correct statement from the following regarding cell membrane

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Select the correct statement from the following regarding cell membrane

Lipids are arranged in a bilayer with polar heads towards the inner part.

Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.

Na+ and K+ ions move across cell membrane by passive transport.

Proteins make up 60 to 70% of the cell membrane

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