1. Extra Credit: Amoeba Sisters Video Recap
Tuesday
February 21, 2017
I can:
understand how the cell membrane allows for passive transport
Agenda
(10) Catalyst
(15) Kahoot
(20) GN: Cell Membrane and Transport
(20) Amoeba Sisters Video
(15) IP: Diffusion
(5) Exit Ticket
Catalyst
What are the 4 classes of biomolecules?
What is the monomer of a lipid?
What is the function of a carbohydrate?
What is the function of a nucleic acid?
HW: Diffusion IP;
Extra Credit: Amoeba Sisters Video Recap

2. Reminder! Test corrections due THURSDAY!
Biomolecules & Cell Membrane quiz FRIDAY

3. What boundary separates one country from another?
Borders separate one country from another.

4. All cells are surrounded by a thin, flexible boundary known as the cell membrane that separates it from its surroundings.

5. Cell Membrane
How does the cell membrane regulate the contents of the cell?
The cell membrane regulates what enters and leaves the cell.
made up of a phospholipid bilayer
protein channels and carbohydrate “ID tags” are embedded in the bilayer
= two layers of phospholipids

6. Concentration Concentration refers to the “crowdedness” of an area.
low concentration
high concentration

7. Equilibrium
When the concentration of a substance is the same throughout the area, it has reached equilibrium.
The dye concentration
has reached equilibrium.

8. Brownian Motion
Particles in a liquid are moving constantly in random directions.

9. aka moving down a concentration gradient
Diffusion
Particles move from an area where they are more concentrated to where they are less concentrated until equilibrium is reached.
This process is called diffusion. Because it results from random motion, it does not require energy.
aka moving down a concentration gradient

10. Diffusion Does this process require energy?
high concentration
low concentration
Molecules start diffusing throughout the liquid…
…until equilibrium is reached.
Does this process require energy?

11. Draw on your board: How will the molecules move
Draw on your board: How will the molecules move? What process is this called?

12. Draw on your board: How will the molecules move
Draw on your board: How will the molecules move? What process is this called?

13. Write on your board: In which direction will the molecules move?

14. Write on your board: In which direction will the molecules move?

15. Write on your board: In which direction will the molecules move?

16. Write on your board: In which direction will the molecules move?

17. Write on your board: In which direction will the molecules move?

18. Write on your board: In which direction will the molecules move?

19. Draw on your board: What will the beaker look like in 10 minutes?

20. Draw on your board: What will the beaker look like in 10 minutes?

21. Draw on your board: What direction will the molecules move in?
80% salt
cell
20% salt

22. Draw on your board: What direction will the molecules move in?
80% salt
cell
20% salt

23. Draw on your board: What direction will the molecules move in?
25% salt
cell
20% salt

24. Draw on your board: What direction will the molecules move in?
25% salt
cell
20% salt

25. Draw on your board: What direction will the molecules move in?
25% salt
cell
60% salt

26. Draw on your board: What direction will the molecules move in?
25% salt
cell
60% salt

27. Draw on your board: What direction will the molecules move in?
60% salt
cell
60% salt

28. Draw on your board: What direction will the molecules move in?
60% salt
cell
60% salt

29. Selective Permeability
permeable = lets things pass through
impermeable = does not let substance pass
selectively permeable = allows certain things to pass through
The cell membrane is selectively permeable.

30. The cell membrane is impermeable to large molecules like glucose.

31. What happens when a membrane is impermeable to a substance but not to water?
Osmosis!

32. low concentration of H2O high concentration of H2O
Osmosis
Water moves from high to low concentration of water until equilibrium is reached.
Osmosis is the diffusion of water.
does not require energy
low concentration of H2O
high concentration of H2O

33. Which way will the water move?

34. Which way will the water move?

35. Which way will the water move?
other solute

36. Which way will the water move?

37. Which way will the water move?
*the membrane is impermeable to salt*
80% salt
cell
20% salt

38. Which way will the water move?
*the membrane is impermeable to salt*
80% salt =
20% water
cell
20% salt =
80% water

39. Which way will the water move?
25% salt
cell
20% salt

40. Which way will the water move?
25% salt
cell
20% salt

41. Which way will the water move?
25% salt
cell
60% salt

42. Which way will the water move?
25% salt
cell
60% salt

43. Amoeba Sisters