1. Question of the Day
12-6
How are diffusion and osmosis related?

2. What's a semi-
permeable membrane?

3. Review

4. Turgor Pressure –
the pressure that exists inside a cell caused by water
High turgor pressure can cause animal cells to burst. Why?
They do not have a cell wall.
What would happen if there is low turgor pressure in plants?
Causes them to wilt
Then you water the plant and it will regain the pressure and stand up straight

5. Reverse Osmosis

6. 12-6
Lab
Page 6 questions

7. Question of the Day Explain the diagram below. 12-7 Iodine and water
A couple hours
Corn starch and water

8. Contractile Vacuoles –
Organelle that excretes excess water from cells
Uses ATP
Usually found in unicellular freshwater organisms.
This prevents them from bursting in a hypotonic solution.

9. Contractile vacuole

10. Plasmolysis –
loss of turgor pressure in plant cell due to loss of water
What happens to a plant during plasmolysis?
The plant wilts
The plants plasma membrane and cytoplasm will shrink away from the cell wall

11. REVIEW: What will happen to an Elodea Leaf in a hypertonic solution?
Water will leave the cell…
…which is called playsmolsis, which will cause the plant leaves to wilt
Cell membrane
Cell membrane

12. Review If we put Elodea leaves in a hypotonic solution, what happens?
Water will move into the cell….
….which will cause the cell to swell. If it’s an animal cell it will….
…burst, UNLESS the cell has a
Contractile vacuole to pump the water out. to
Cell membrane pushing
against the cell wall

13. Summary of Hypo/Hypertonic solution changes on a RBC.

14. Review If the cell shrinks, it is in what type of solution?
If the cell is at equilibrium with it’s environment, its in what type of solution?
If the cell swells, it’s in what type of solution?
Water –90%
Salt – 10%
Water 95%
Salt 5%
Water 64%
Salt 36%
Water 44%
Salt 56%
Water 50%
Salt 50%
Water 50%
Salt 50%

15. pages 6-7 assignment

16. Control egg pd 1 = 50.9 g
Control egg pd 2 = 60.8 g

17. Question of the Day
12-8
How is the egg in lab analogous to a cell?

18. Nicole
Cayo
Kyle
Natalie Gilbert
Libby
Justin Smigley
Kenny
Evan
Allan
Mary
Ryan Freeman
Sinner
Matt
James
Kamil
Lauren
Allie Clowney
Victoria
Max
Ali
Vince

19. Quick Talk Hypertonic solution Phospholipid Diffusion
Contractile vacoule
Turgor pressure
Isotonic solution
Osmosis
Hypotonic molecule
Lyse
Cell membrane
Plasmolysis

20. Question of the Day 1. What is passive transport (notes page 2)?
12-9
1. What is passive transport (notes page 2)?
2. What’s an example?

21. Nicole
Cayo
Kyle
Natalie Gilbert
Libby
Justin Smigley
Kenny
Evan
Allan
Mary
Ryan Freeman
Sinner
Matt
James
Kamil
Lauren
Allie Clowney
Victoria
Max
Ali
Vince

22. Objectives
12-8
Describe how the structure of the plasma membrane allows it to function as a regulatory structure and/or protective barrier for a cell.

23. Quiz Friday
12-10

24. LAB

25. page 9
review questions

26. Selective Permeability –
plasma membrane to allow some materials to pass while keeping others out
Why is selective permeability important?
So the cell can allow important substances in (water, oxygen, glucose) and keep harmful substances out (bacteria). 26

27. Passive Transport Passive Transport –
movement of particles across membranes by diffusion
This process uses NO ATP
Molecules moving from hi concentration  low concentration 27

28. Facilitated Diffusion –
name for passive transport using proteins
Does not use energy!!!
Example:
Glucose going from high concentration outside cell low concentration inside the cell
Why doesn’t this need energy?
Because it’s still along the concentration gradient
carrier
proteins 28

30. 30

31. 31

32. HOMEWORK
my.hrw.com – Chapter # 5 Self Check Quiz # 1 – 4 of these questions will appear on quiz (ignore #s 7 and 8) 32

33. 1, 2, 3 assessment

34. http://images. google. com/imgres. imgurl=http://www. goldiesroom 34

35. Egg Lab Report Graph Add a column to you data table: Must be colored
Starting Mass (grams)
Final Mass (g)
Change in mass (g)
% Change in Mass
((Initial Mass – Final Mass) / Initial Mass) x 100
Egg in shell
=====
====
===
Vinegar
Corn Syrup
Distilled
Graph
Must be colored
Graph your starting mass and then use your final mass data which is in blue
Add a column to you data table:
“Percent Change in Mass”
((Initial Mass – Final Mass) / Initial Mass) x 100
Calculate all the changes in mass for your egg 35

36. Egg Lab Report Analysis of your Data: What you should turn in:
Be sure you are using the terms we’ve discussed in class in your explanation of your results.
Example
What you should turn in:
Page 1 – Directions
Page 2 – Written lab report
Page 3 – Graph
Page 4 – Your actual lab procedure 36

37. Transport / carrier proteins –
proteins that assist facilitated diffusion 37

38. Ion channels are ion specific
proteins transport ions from high concentration to lower concentration
Ions like Na+, Ca+, etc are not soluble in lipids, so they must travel through proteins channels
Ion channels are ion specific
Some channels are always open, some have gate
Gates open from stimuli: stretching of cell membrane electrical or chemical signals

40. Active Transport Active Transport – ATP (adenosine tri-phosphate) –
transport of materials against a concentration gradient – requires energy
ATP (adenosine tri-phosphate) –
the ENERGY molecule for the cell
Breaks down from ATP  ADP (Adenosine di-phosphate)
Hydrolysis of the phosphate releases energy

41. Active Transport Example http://www. youtube. com/watch

42. Sodium-potassium Pump – transfer protein example
Transfers Na+ out and K+ in
Creates electrical gradient which is important for nerve impulses

44. Na+ / K+ Pump

45. Endocytosis –
when a cell surrounds and takes in material from the environment
Uses ATP

47. Endocytosis

48. Pinocytosis –
Transport of fluids into the cell

49. Phagocytosis – Phagocytes –
Transfer of large particles / cells into the cell
Phagocytes –
Cells that ingest bacteria / viruses and lysosomes fuse w/ vesicle to destroy them before harm done

50. Exocytosis –
when a cell expels materials to the extracellular environment
Cell exports proteins, hormones and wastes this way
This process uses ___ATP___

51. Endo / Exocytosis

52. Exocytosis and endocytosis

53. The End

54. Warm Up 1-5
Draw and Label Each – hypotonic, hypertonic, isotonic, active transport, diffusion: (Blue circles = cells)
NaCl 12%
NaCl 25%
NaCl 20%
NaCl 35%
Sugar 10%
Sugar 5%
ATP used

55. Dialysis Tubing Lab Groups of two or three (NOT 4)
Read through part 1 – create a flow chart of the procedure

56. Warm Up 1-6 How is the dialysis tubing “selective”?
Get out your dialysis tubing lab.

57. Warm Up 1-6 Get you Part II lab set up
Make your observations – finish lab questions
Turn in your lab.
Today:
Begin photosynthesis chapter

58. Warm Up 1-7 Get your Part II lab set up Make your observations
Finish the lab questions – Turn in Lab
Today:
Start Photosynthesis!!

59. Hypo / Hypertonic Solutions