4. What single characteristic of the selectively permeable membranes used in the laboratory determines the substances that can pass through them? In addition to this characteristic, what other factors influence the passage of substances through living membranes? 5. A semipermeable sac filled with a solution containing 4% NaC1,9% glucose, and 10% albumin is suspended in a solution with the following composition: 10% NaCl, 10% glucose, and 40% albumin. The diagram below illustrates the solutes inside and outside of the sac. Assume that the sac is permeable to all substances except albumin. With respect to net movement, state whether each of the following will (a) move into the sac, (b) move out of the sac, or (not move, 4% Naci 9% glucose 10° albumin 10% NaCl, 10% glucose, 40% albumin glucose: albumin: water: Naci: 6. Summarize below the results of Activity 5. Experiment 1 (Investigating Diffusion and Osmosis Through Living Membranes-the egg). List and explain your observations Egg 1 in distilled water Egg 2 in 30% sucrose:
