Select the correct statement regarding the cell membrane from the following

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$N a^{+}$ and $K^{+}$ ions move across cell membrane without carrier proteins

Proteins make up 60 to 70% of the cell membrane

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

Lipids are arranged in a bilayered cell membrane with polar heads towards the inner part

answer is D.

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Detailed Solution

A) $N a^{+}$ and $K^{+}$ Ions move across cell membrane are carried via carrier proteins called pumps as they need energy.

B)The relative composition of lipids and proteins in a cell membrane is variable between different types of cells.

C) Lipids are arranged in a bilayered cell membrane with polar heads towards the outer part and hydrophobic tails towards the inner side.

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