$A$: $RBC$ membrane is highly flexible.
$R$: Amount of external protein in the cytoplasmic face of the membrane is more.

Select the correct statements regarding cell membrane in eukaryotic cell.
$A$. Membrane of human $RBCs$ has approximately $52\%$ protein.
$B$. Major phospholipids are arranged in a bilayer.
$C$. Extensions of the plasma membrane into the cell form mesosomes.
$D$. Tails towards the inner part of lipids are hydrophobic and thus protected from aqueous medium.
$E$. Glycocalyx is present on the outer surface of the plasma membrane.
Choose the correct answer from the options given below:

The model given by Singer and Nicolson in $1972$ was the . . . . . . for the plasma membrane.

Which of the following is described as a quasi-fluid and functionally dynamic membrane?

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

What is true about the fluid-mosaic model of the cell membrane?