New cell wall polysaccharides and enzymes that must modify the wall(to weaken or add to and reinforce the wall) are big molecules! How big a molecule...

New cell wall polysaccharides and enzymes that must modify the wall(to weaken or add to and reinforce the wall) are big molecules! How big a molecule can move through the wall? How would you measure "pore size" (i.e.,wall porosity)?