1. 3/31 Daily Catalyst Pg. 43 Osmosis
1. For molecules to diffuse, they must move from _________ concentration to _________ concentration.
2. Mrs. Ireland gives you a mystery cell. The cell appears to have a rod-shape. What type of cell is this?
3. How will the solute molecules move in the cell below if the cell is using diffusion?

2. 3/31 Daily Catalyst Pg. 43 Osmosis
1. For molecules to diffuse, they must move from _________ concentration to _________ concentration.
2. Mrs. Ireland gives you a mystery cell. The cell appears to have a rod-shape. What type of cell is this?
Prokaryote
3. How will the solute molecules move in the cell below if the cell is using diffusion?
HIGH
LOW

3. 3/31 Class Business Pg. 43 Osmosis
Quiz #10 on Wednesday
Cell and Transport test on Wednesday
Review day on Tuesday
M.C. on cells and transport
Tutoring available
Spring Break review packet due Tuesday, April 7th

4. 3/31 Agenda Pg. 43 Osmosis Daily Catalyst Class Business Osmosis notes
Lab time
Exit Ticket #9

5. Transport Review Label the integral protein:
This type of protein acts as an appendage to the bilayer
d, c, and e
Label the hydrophobic tail A
This structure allows molecules to cross
one side of the membrane to the other like a
bridge: a

6. PASSIVE TRANSPORT
DIFFUSION
OSMOSIS

7. Diffusion Review
Diffusion is when solutes/molecules move across a membrane, but sometimes the solutes cannot get through. This is when osmosis happens.

8. Key Point #1:
Osmosis is the movement of water from high to low concentrations.

9. Osmosis is passive transport
This means…
ATP (energy) is not used
Water molecules move from high to low concentrations

10. OSMOSIS
Water is moving in osmosis

11. Which way will water move?
Key Point #2: Water will move in and out of the cell until the concentration is equal.

12. Prefixes
Iso-  same as
Hypo-  less than
Hyper-  more than

13. Concentration is equal. No net water movement.
Isotonic Solution
Key Point #3: Isotonic:
Concentration is equal. No net water movement.

14. Inside Cell Outside Cell Isotonic Solution
The red dots are water molecules
Outside Cell

15. Key Point #4: Less water in the cell Water moves INTO the cell.
Hypotonic Solution
Key Point #4: Less water in the cell Water moves INTO the cell.

16. Outside Cell Inside Cell Hypotonic Solution
The red dots are water molecules

17. Outside Cell
Hypotonic Solution
Inside Cell
Water
Water
Water

18. Inside Cell Outside Cell Water Water Hypotonic Solution Water
Hypo=Hippo
Water
Water

19. Key Point #5: More water inside the cell Water moves OUT of the cell.
HYPERtonic Solution
Key Point #5: More water inside the cell Water moves OUT of the cell.

20. Hypertonic Solution
Outside Cell
Inside Cell

21. Hypertonic Solution
Outside Cell
Inside Cell
Water
Water
Water

22. Hypertonic Solution
Inside Cell
Water
Water
Outside Cell
Water

23. Tell me what ya know!
A cell is bathed in fluid. However, you notice that water is flowing out of the cell. In what kind of solution is this cell immersed?
Hypertonic Solution
hyper

24. Label the following cells as hypotonic, hypertonic, or isotonic.
(the red dots are water molecules) 1 3 2

26. Draw and describe a plant cell in a hypotonic solution
Draw and describe a plant cell in a hypotonic solution. How will a plant cell respond differently than an animal cell? Why?

27. Draw in your notes

28. Onion Cell before and after being put in a Hypotonic Solution
Before After
Hypotonic Solutions absorbs so much water out of the water out of cells that they may burst open. The plant cells usually do not explode. WHY??

29. Animal Cells Mostly do Explode Because:
They don’t have a cell wall to keep the structure intact, but plant cells do

30. Lab Work Time
Directions: With your group, complete the Tuesday (Day 2) directions. We are making observations of our test subjects.
Time: 10 minutes
Noise: 2 (with group members)

31. Exit Ticket #9 Name: _______ Date: 3/31 Period: 1 Score: ______/4
Indicate the direction of water: a .5% sucrose solution cell and a 2% sucrose solution cell- separated by a membrane not permeable to sucrose. What will the cell do?!
.5% Sucrose
2% Sucrose
Sucrose can’t move, but water can! So Water will move to equalize concentrations.
The water will move from the .5% cell to the 2% cell to equalize concentrations. The 2% cell will fill with water until the cell burst

32. Diffusion Osmosis Active transport Endocytosis Exocytosis Definition
Active/passive?
Real Example
Drawing