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Polar molecules are hydrophylic. Because the inner portion of the phospholipid bilayer (plasma membrane) consists of hydrophobic interactions, generally polar molecules cannotâ¦ pass directly though. These molecules require protein channels to actively or passively move between the cytosol and the plasma membrane.
Plasma membranes are selectively permeable, regulating the cellâs molecular traffic. Hydrophobic (nonpolar) molecules, such as hydrocarbons, can dissolve in the lipid bilayer and. pass through the membrane rapidly. Polar molecules, such as sugars, do not cross the membrane easily.Transport Membranes. Transport proteins allow passage of hydrophilic substances across the membrane.Some transport proteins, called channel proteins, have a hydrophilic channel that certain. molecules or ions can use as a tunnel. Channel proteins called aquaporins facilitate the passage of water.Other transport proteins, called carrier proteins, bind to molecules and change shape to shuttle. them across the membrane.lasma membranes are selectively permeable, regulating the cellâs molecular traffic. Hydrophobic (nonpolar) molecules, such as hydrocarbons, can dissolve in the lipid bilayer and. pass through the membrane rapidly. Polar molecules, such as sugars, do not cross the membrane easily.