The molecular identity of water-channel proteins in plasma membranes of plants has been confirmed but there remain a number of unresolved questions about their role in cell and tissue water relations, their interaction with the lipid components of membranes and the relationship between water movement through membranes by diffusion in the bilayer.. The lipid bilayer as the plasma membranes of cells back in the 1920’s, it was correctly proposed that water could move through the membrane simply by diffusing through the lipid bilayer. the current view is that the lipid bilayer has a finite permeability for water, but, in addition, a set of proteins exists that we now refer to as. Lipid bilayer definition. a lipid bilayer is a biological membrane consisting of two layers of lipid molecules. each lipid molecule, or phospholipid, contains a hydrophilic head and a hydrophobic tail. the tail regions, being repelled by water and slightly attracted to each other, congregate together..
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