1. Warm-Up #5 1) What organelle is semi-permeable? 2) What organelle acts as UPS and “fixes” by packaging and sending proteins? 3) What is the function of the nucleus?

2. Diffusion and Osmosis

3. Cell Membrane – Security Guard The cell membrane is semi-permeable The cell membrane is semi-permeable It only allows certain materials in and out of the cell It only allows certain materials in and out of the cell

4. Diffusion Diffusion is the process in which small materials such as oxygen move in and out of the cell. Diffusion is the process in which small materials such as oxygen move in and out of the cell.

5. How Does Diffusion Happen? Diffusion of materials occurs when one substance moves from ____________ concentration to _____________ concentration. Diffusion of materials occurs when one substance moves from ____________ concentration to _____________ concentration. http://zoology.okstate.edu/zoo_lrc/bi ol1114/tutorials/Flash/Osmosis_Anim ation.htm High Low

6. EQUILIBRIUM Materials move from areas where there is a lot of substance to areas where there is little substance until both sides are at Materials move from areas where there is a lot of substance to areas where there is little substance until both sides are at EQUILIBRIUM

7. OSMOSIS Osmosis is the process in which water enters and leaves the cell Osmosis is the process in which water enters and leaves the cell

8. Osmosis In Osmosis, water goes from low to high ion concentration In Osmosis, water goes from low to high ion concentration An ion is salt An ion is salt

9. Hypertonic If there are more ions outside of the cell than inside, the water moves out! If there are more ions outside of the cell than inside, the water moves out! The solution is hypertonic The solution is hypertonic

10. Hypotonic If there are more ions inside the cell, than outside, water rushes in! If there are more ions inside the cell, than outside, water rushes in! The solution is Hypotonic The solution is Hypotonic

11. Isotonic If there is the same amount of ions inside and outside of the cell, osmosis doesn’t happen If there is the same amount of ions inside and outside of the cell, osmosis doesn’t happen The cell is isotonic The cell is isotonic

12. Question A cell is placed in a 50% salt solution. What will happen to the cell? Assume the cell is 1% salt. Show arrows and label hyepertonic and/or isotonic. Inside Cell __% Water ___% salt Outside cell ___% water ___% salt 199 50 Water goes out hypertonic

13. Question A cell is placed in a 20% salt solution. What will happen to the cell? Assume the cell is 30% salt. Show arrows and label hyepertonic and/or isotonic. Inside Cell __% Water ___% salt Outside cell ___% water ___% salt 3070 80 20 Water goes in hypotonic

14. Quiz! Number 1-8 on page ________

15. 1. Semi-permeable means a. The membrane lets all things in but nothing out of the cell. b. The membrane lets some things in and some things out of the cell. c. The membrane lets nothing in and nothing out of the cell. d. The membrane lets everything in but nothing out of the cell.

16. 2. Substances move a. From low concentration to high concentration b. From left to right c. From high concentration to low concentration d. From right to left

17. 3. Molecules will move through the membrane until a. There are no more substances on the outside b. The inside is full c. Equilibrium is reached d. None of the above

18. 4. The yellow dots will a. Stay where they are b. Move into the cell c. Move in and out of the cell d. Move out of the cell

19. 5. Osmosis is a. Water moving from low to high concentration b. Water moving in and out of the cell c. Toxins moving out of the cell d. Oxygen moving in and out of the cell.

20. 6. Hypertonic means a. Water moves out of the cell b. Water moves into the cell c. Water moves in both direction equally d. Water does not move

21. 7. Hypotonic means a. Water moves out of the cell b. Water moves into the cell c. Water moves in both direction equally d. Water does not move

22. 8. isotonic means a. Water moves out of the cell b. Water moves into the cell c. Water moves in both direction equally d. Water does not move

23. Time to set-up your lab! Write your hypothesis Write your hypothesis Write Procedures Write Procedures Create data table Create data table Later you will perform conclusion Later you will perform conclusion