the composition of lipids in the outer and inner monolayers/leaflets of cell membrane lipid bilayers is question 3 options: twice as concentrated in the inner monolayer as in the outer monolayer. identical in each monolayer. highly random for each monolayer. asymmetrical or different in each monolayer. the same for all cell plasma membranes but different from the composition in mitochondrial and chloroplast membranes.