The structure is of lipid bilayer or phospholipid bilayer found in cell or plasma membrane.
Step-by-step explanation:
a) The most important property of lipid bilayer is that it is highly impermeable and does not allow molecules except gases and water through it unless integral proteins or ion channel comes in the action.
b) There are receptors and ion channels on the cell membrane that allow only specific exchange of ions, gases, nutrients, metabolites between cellular and extracellular environment.
c) The phospholipid bilayer has specific integral and peripheral proteins, ion channels which regulate the materials in cells.
d) The bilayer of lipid is arranged such that it has hydrophilic heads of phosphate group and hydrophobic tail of fatty acid. The water is a small molecule diffuses through protein channels also the osmotic pressure difference leads to movement of water in the cell.