1. Day 14 DO NOW: What happens when you put salt on a slug or a snail
Day 14 DO NOW: What happens when you put salt on a slug or a snail? AIM: What is Osmosis?

3. What is osmosis? Osmosis is the diffusion of water through a membrane.
Like regular diffusion, water will move from one concentration to another until both sides are equal in concentration
10 Salt
10 Water
20 Salt
20 water
20 Salt
10 water
10 Salt
20 Water

4. How is osmosis different than diffusion?
In diffusion, the solute (the dissolved material) moves from a high concentration to a low concentration.
Remember that the solute is small molecules such as glucose, fatty acids, amino acids, oxygen, carbon dioxide and water.
But because some molecules are too big to get across the membrane, water has to move in toward these large molecules in order to dilute the concentration.

5. What are the effects of osmosis? (a)
If the concentration of water inside the cell and outside the cell is the same, there is no net osmosis occurs.
Water goes in
Water goes out

6. What are the effects of osmosis? (b)
If the concentration of water is higher outside the cell than inside the cell, the water outside the cell will move inside the cell.
Pop!!
Water goes in (only)

7. What are the effects of osmosis? (c)
If the concentration of water is higher inside the cell then outside the cell, the water inside the cell will move outside the cell.
Water comes out (only)
Salt sucks the water out of the cell

8. How does osmosis affect plant cells?
All cells goes through osmosis.
Because plant cells have a cell wall surrounding it, the cell looks differently when osmosis occurs.

9. If the plant cell is placed in a solution of high concentration of solute……
then the water will leave the cell causing the cytoplasm to shrink.
The cell wall remains the same!!

10. If the plant cell is placed in a solution of low concentration of solute……
then the water will enter the cell causing the cytoplasm to swell.
The cell wall begins to swell, deforming the shape!!

12. Day 15 What is Passive and Active Transport?
DO NOW: How would you define someone who is active? ____________________
How would you define someone who is passive? ___________________________
Day 15 What is Passive and Active Transport?

13. There are 2 ways molecules can get in a cell.
1) Passive Transport – This type of transport requires no energy (no ATP). The cell uses the natural process of different concentration and molecule size to help molecules move from one area to another.

14. How to Remember Passive Transport
Energy (ATP)
Greater Concentration
Examples:
Diffusion
Osmosis
Lesser Concentration

15. There are 2 ways molecules can get in a cell. (cont)
2) Active Transport – This type of transport requires energy (ATP) to move molecules across the membrane. Some molecules must go against the concentration grain, therefore they rely on protein “pumps”. To get them across.

16. How to Remember Active Transport
Active transport that requires energy. Movement molecules from low concentration to high.
Need Energy (ATP)
Greater Concentration
Lesser Concentration

17. Other Type of Active Transport
Phagocytosis- Movement of large material into the cell. Cell “pinches” the membrane forming a “bubble” around the large material.

18. Why is Cellular Transport Important?
Cells need materials in order to carry out the 8 life functions
Cells need O2 and glucose to perform respiration
Cells need to get rid of waste products (CO2 & excess water)
Cells need to grow and repair itself
Cells need molecules to break apart and recombine to make new molecules.
Without cellular transport, cells could not do what they do.

19. Type of cellular Transport
Energy / No Energy
High to low
Low to high
Special circumstances
Diffusion
No energy
Small molecules
Osmosis
water
Passive Transport
Diffusion/ osmosis
Active Transport
Energy (ATP)
Large molecules / cell doesn’t want
Phagocytosis
Energy
Large particle
Cell engulfs large particles

20.                                                 
Red Onion in tap water

21. Red Onion in distilled water starting to rehydrate
                                                

22. Red Onion eventually goes back