The lipid bilayer molecules do what for the cell?

phospholipids

helps strengthen the bilayer and decrease its permeability, also helps regulate the activity of certain integral membrane proteins

Proteins and phospholipids.

Non ionized molecule pass through the lipid bilayer faster than ionized molecules because of the hydrophobic portion of the lipid bilayer. non ionized molecules are ex glucoseionized molecute Na, K

it depends on what you are referring to. the lipid bilayer is exactly what it says. it is two layers compsed of lipids. lipid molecules have two properties: a hydophobi tail and a hydrophilic head....