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(D) The fluid mosaic model of the cell membrane was proposed by $S.J. Singer$ and $G.L. Nicolson$ in $1972$.$Na^+$ and $K^+$ ions require active trans

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The fluid mosaic model of the cell membrane was proposed by Singer and Nicolson.

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(D) The fluid mosaic model of the cell membrane was proposed by $S.J. Singer$ and $G.L. Nicolson$ in $1972$.$Na^+$ and $K^+$ ions require active transport (using energy) to move across the membrane against the concentration gradient.The protein content in the cell membrane varies; for example,in human erythrocytes,it is about $52\%$ protein and $40\%$ lipids.In the lipid bilayer,the polar (hydrophilic) heads are directed towards the outer sides,while the hydrophobic tails are directed towards the inner side.

Select the correct statement regarding the cell membrane.

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