Hich of the following describes the structure and function of the cell membrane? a. the hydrophilic head groups of the lipid molecules are exposed to the outside of the cell and the cytoplasm, which is a water-like environment. the hydrophobic tails form an oily layer inside the membrane that keeps water out of the cell. b. the hydrophilic head groups of the lipid molecules are exposed to the outside of the cell and the cytoplasm, which is a water-like environment. the hydrophobic tails form an oily layer inside the membrane that allows water to enter the cell. c. the hydrophobic head groups of the lipid molecules are exposed to the outside of the cell, which is a water-like environment. the hydrophilic tails form an oily layer inside the membrane that keeps water out of the cell. d. the hydrophobic head groups of the lipid molecules are exposed to the outside of the cell, which is a water-like environment. the hydrophilic tails form an oily layer inside the membrane that allows water to enter the cell.