Cell wall transport

Part 1 - Diffusion through an Artificial Membrane Purpose This experiment will demonstrate differential permeability in the model cell. Hypothesis Because iodine is much smaller than starch, Iodine solution will move through the membrane but starch will not. Method Prepare iodine solution in jar. Pore glucose solution and starch solution into membrane bag. Gently set the bag in the iodine solution. Observe and check for color changes. Iodine molecules in the solution (orange) will flow by …

…gradient. Osmosis is the passive transport (diffusion) of water. In osmosis, water moves through a semi-permeable membrane from a region of higher concentration to a region of lower concentration. The terms hypotonic, hypertonic, are used to compare solutions relative to their solute concentrations. The hypotonic side is the side with the larger water percentage and a lower solute concentration. The hypertonic side is the side with the smaller water percentage and a higher solute concentration.