Select the correct statement regarding the ce | vedclass

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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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The ultrafiltration theory for the permeability of the cell membrane was put forth by:

The Nobel Prize of $1991$ for discovering single ion channels in cells was awarded to:

Integral proteins of the cell membrane occur on/in

$A$: Lipids are arranged within the cell membrane with the hydrophobic tails towards the inner part.
$R$: This ensures that the non-polar tail of saturated hydrocarbons is protected from the aqueous environment.

What is the cell membrane composed of?

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