Diffusion through a Membrane Simulation

1. Diffusion through a Membrane Simulation

2. Beaker

4. Cell

6. Starch Starch Molecules

7. Starch Glucose Glucose Molecules

8. Starch Glucose Iodine Iodine Molecules

9. Starch Give it some time……. Glucose Iodine

10. Starch Glucose Iodine

11. Starch Glucose Iodine

12. Starch Glucose Iodine

13. Starch Glucose Iodine

14. Starch Glucose Iodine

15. Starch Glucose Iodine

16. Starch Glucose Iodine

17. Starch Glucose Iodine

18. Starch Times Up! Glucose Iodine

19. Starch Glucose Iodine

20. What Diffused in and out the Cell? Starch Glucose Iodine

21. Starch Glucose Iodine

22. Starch Diffused IN Glucose Iodine Water

23. Starch Glucose Iodine

24. Starch Diffused OUT Glucose Iodine

25. Starch Glucose Iodine

26. Starch Didn’t Diffuse at All Glucose Iodine

27. Starch Glucose Iodine

28. What about a real Cell? Lets look at the epidermis of a Red Onion….Up Close.

30. If we make a wet mount slide of a Red Onion Epidermis it would look like this:

31. If salt water is added, there will be more salt outside the cell than in. The cell loses water through osmosis as it tries to create a ratio of water:salt inside the cell that matches the outside

32. This Process is Called Plasmolysis

39. What if we add water without salt?

46. NYSED Part D Lab Review NYSED Part D Lab Review

47. Diffusion and Osmosis • Designed to help you understand the concepts of Diffusion and Osmosis and how these cell processes effect the cell; • Define: diffusion, osmosis, hypertonic, isotonic, hypotonic, saline, selectively permeable, molecule size;

48. Part 1: Diffusion • Diffusion: movement of molecules from an area of high concentration to an area of low concentration along the concentration gradient. • Example is when you put your Lugol’s solution into the water and the water began to turn the “rust/tea” color. After diffusion occurs… Before diffusion occurs…

49. Part 2: Create a “cell” • Soak 10 inches of dialysis tubing; • Tie knot in one end; • Put 10mL of glucose solution in and 20mL of starch solution in; • Pinch/clamp closed and put into cellular environment (Lugol’s and water) for 15 minutes; • Observe the changes and infer what happened Wait about 15 minutes and observe. Insert into “cellular environment”

50. After 15 minutes, observe… • What happened to the glucose in the “cell”? …the starch in the “cell”? …the Lugol’s iodine outside the “cell”? Why? S S G I G G G I I G I G I S S Iodine solution (I) I I I Glucose solution (G) Starch solution (S) At the beginning… After 15 minutes…