Question

4.which statement is true about lipid bilayer of plasma membrane?
.
A.permiable to large ionic polar molecule

B.permeable to small ionic molecule

C.permiable to only polar molecule

D.none of above​

Answer 1

$\large \rm \orange {\underline{\underline{✧Answer:-}}}$

$\hookrightarrow \tt {\boxed{\underline{✰Option-C}}}$

☞Bilipid layer of Plasma membrane is permeable to only polar molecules.That too only small polar molecules.

$\large \rm \purple {\underline{\underline{✧Description:-}}}$

➭The plasma membrane is selectively permeable.Hydrophobic molecules and small polar molecules can diffuse through the lipid layer, but ions and large polar molecules cannot diffuse.

➭The detailed structure of the plasma membrane was studied only after the advent of the electron microscope in the 1950s.But the improved model of structure of the cell membrane was proposed by "Singer and Nicolson" in 1972.It is widely accepted as "Fluid Mosaic Model".

➭The cell membrane is mainly composed of lipids(phospholipids) and Proteins.In addition to phospholipids, membrane also contains cholesterol.

➭The 'quasi-fluid nature' of lipid enables lateral movement of proteins within all overall bilayer.This ability to move within the membrane is measured as it's "fluidity".