A very simple biology project about cell membranes (and first project in like 6 months lol) :) Click each part (there are 4) to learn more. Press space to exit the information tab. Cell membranes are the layer around a cell that serves as protection and structure for the cell. The membrane is also essential for transportation of substances into and out of the cell. The 4 sections: - Phospholipid bilayer - Integral proteins - Peripheral proteins - Cholesterol (lipid) Made for the SDS, Scientific Discoveries