L-form bacteria rely on their cell membrane as their protection from the external environment, determining what can move in and out of the cell. bacteria with cell walls have additional protection, but need to synthesize the peptidoglycan precursors within the cell and then transport them across the membrane to maintain or expand the cell wall. the peptidoglycan precursors require assistance in moving across the membrane, which is accomplished by a hydrophobic molecule called bactoprenol. why is it important for peptidoglycan precursors to be sufficiently hydrophobic in order to cross the cell membrane?