Which statements about lipid bilayers are true? a. their formation is driven by the hydrophobic effect. b. the amphipathic molecules that make up the bilayers orient themselves such that their polar head groups point out toward the aqueous solvent and their hydrophobic tails are pointed toward the interior of the bilayer. c. they serve the role of physical compartmentalization of components within a cell. d. they can be made up of phospholipids.