What is one difference between a cell wall and a cell membrane? a. call wall have gap junctions. cell membrane have plasmondesmata b. cell walls act as a boundary that nothing can pass through. cell membrane allow materials in and out of cell. c. cell walls are found inside the cell membrane. the cell membrane is the outermost structure of a cell. d. cell walls are made of cellulose. cell membrane are made of protein and phospholipids