All cells use .
All cells rely on fats and cholesterol as building - blocks to create the multiple membranes that cells use both to control internal water content and internal water - soluble elements and to organize their internal structure and protein enzymatic systems .
All cells use and rely on fats and cholesterol as building - blocks to create the multiple membranes that cells use both to control internal water content and internal water - soluble elements and to organize their internal structure and protein enzymatic systems .