1. Diffusion Lab Notes ;) A. Color of starch:________________
Cloudy/white
A. Color of starch:________________
starch is made of _______________ molecules.
B. Color of iodine:________________
iodine is made of ____________ molecules.
C. When iodine and starch come into contact,
the solution turns ____________.
Polysaccharide/large
Amber/orange/brownish
small
Dark blue/black

2. Choices for Hypothesis:
1. Iodine will leave the cup and enter the bag.
2. Starch will leave the bag and enter the cup.
Starch and iodine will change places.
**** Remember what happens when starch
and iodine come in contact?

3. Chapter 7-3 Notes Part 2
Types of Transport

4. TRANSPORT CAN BE EITHER

5. Passive Transport
Movement of molecules from areas of high concentration to areas of lower concentration.
does not require energy
high
low
Weeee!!!

6. OR

7. This is gonna be hard work!!
Active Transport
Bottom of the hill
Movement of molecules from areas of low concentration to areas of high concentration.
Requires Energy
high
low
This is gonna be hard work!!

8. Animations of Active Transport & Passive Transport
Types of Passive Transport
Diffusion
Facilitated Diffusion
Osmosis
Types of Active Transport
cell uses energy
Protein Pumps
Endocytosis
Exocytosis

9. All 3 types of PASSIVE transport occur until equilibrium is reached.
when the concentration of a solute is the same throughout a closed system. (i.e. Inside and outside of a cell.)

10. Three Types of Passive Transport Defined

11. 1. Diffusion: random movement of molecules FROM areas of HIGH concentration TO areas of LOW concentration. Example: Alcohol

12. GO TO DIFFUSION ANIMATION

13. Simple Diffusion Animation

14. Facilitated diffusion (Channel Protein) Diffusion (Lipid Bilayer)
Diffusion of specific particles through transport proteins found in the cell membrane Example:Glucose
Transport Proteins are specific – they “select” only certain molecules to cross the membrane
Transports molecules that are large or insoluble in lipids.
Facilitated diffusion (Channel Protein)
Diffusion (Lipid Bilayer)
Carrier Protein

15. 3. Osmosis
Osmosis animation
3.Osmosis: diffusion of WATER through a selectively permeable membrane.
a. Water moves from high concentration of (H2O)to low concentration(of H2O)
Water moves freely through special pores.
Solute (green) soluble in lipids.

16. Draw the lab set up Left side-Tap water Right side- Salt water
Label %water and %solute
Potato
Solution the potato is in.
Draw arrows to show the direction that water moves.
Right side- Salt water
Label %water and %solute
Potato
Solution the potato is in.
Draw arrows to show the direction that water moves.

17. Ch 7-3 Notes Part 3 a. Effects of Osmosis on Life
Cells can not control the movement of water (Osmosis).
ii. If too much water moves into the cell it can burst (die). If too much water moves out it can shrivel up (die).

18. HOW ARE CELLS AFFECTED BY OSMOSIS???

19. A) What happens if?
Outside the cell: lower concentration of solutes and a higher concentration of water
Inside the cell: Higher solute concentration and lower concentration of water.
Result: Water moves from the solution into the cell) Osmotic pressure increases and causes the cell to grow until equilibrium is reached or the cell bursts.

20. B) What happens if?
Outside the cell: Higher concentration of solutes and a lower concentration of water
Inside the cell: lower solute concentration and Higher concentration of water,
Result: Water moves out of the cell into the solution: Cell shrinks/shrivels.

21. C) What happens if? The concentration of solutes and water in the solution is equal to the concentration of solutes and water inside the cell.
Result: Water moves equally in both directions (Dynamic Equilibrium) and the cell remains same size!

22. 1. Which cell was placed in a solution with a concentration of water that was less than inside the cell?
TOO MUCH
OSMOTIC
PRESSURE!!! 2 3 1
Which of these cells shows what would happen
if you were given an IV?

23. How Organisms Deal with Osmotic Pressure
Paramecium (protist) removing excess water video
How Organisms Deal with Osmotic Pressure
1. A protist, like paramecium, has contractile vacuoles that collect water flowing in and pump it out to prevent them from over- expanding.
Contractile Vacuole:

24. 2. Bacteria and plants have cell walls that keep the membrane from bursting when osmotic pressure increases.

25. 3. Animal cells are bathed in blood
3. Animal cells are bathed in blood. Kidneys keep the concentrations of materials in the blood the same as inside the cell by removing excess salt and water.

26. Part 4: Active Transport
Ch 7-3 Notes
Part 4: Active Transport

27. IV. Active Transport (Low  High) A. Requires energy
B. Actively moves molecules to where they are needed
C. Movement from an area of low concentration to an area of high concentration (remember: up the hill)
(Low  High)

28. D. Three Types of Active Transport
Protein Pumps
Endocytosis
Exocytosis

29. D. 3 Types of Active Transport
Sodium Potassium Pumps (Active Transport using proteins)
1. Protein Pumps –Require energy transport molecules across membrane
Example: Sodium / Potassium Pumps are important in nerve responses.
Protein changes shape to move molecules: this requires energy!

30. Types of Active Transport Continued.
2 types of endocytosis
Phagocytosis – cell eating
Pinocytosis – cell drinking
2. Endocytosis: taking bulky material into a cell
a. Uses energy
b. Cell membrane folds in around food particle
“cell eating”
c. forms food vacuole & digests food
d. This is how white blood cells eat bacteria!

31. Types of Active Transport
3. Exocytosis: Forces material out of cell in bulk
a. membrane surrounding the material fuses with cell membrane
b. Cell changes shape – requires energy
EX: Hormones or wastes being released from the cell
Endocytosis & Exocytosis animations