1. *GET A LAPTOP and sign in! *Take out Ch. 7 notes for me to check.
Q.Q. 9/11/18
Explain why the cell membrane is called a “Fluid mosaic” structure.
*GET A LAPTOP and sign in!
*Take out Ch. 7 notes for me to check.

2. CH. 6 Quiz “A” Team
Belen Hernandez

3. Structure and Function
Cell Membranes
Structure and Function

4. Cell Membranes

5. Fluid Mosaic Model

6. Amphipathic molecule “amphi” = both sides, or of two kinds
Phospholipid
hydrophilic heads
hydrophobic tails

7. Proteins are embedded in phospholipid bilayer

8. Phospholipid Bilayer Movement in the lipid bilayer
Lipids can move in a lateral manner *side-to-side
Proteins sometimes move around, sometimes don’t *similar to a buoy.

9. Fluidity Fluidity similar to oil
Will remain a fluid until it becomes so cold that the phospholipids closely pack together
Cholesterol is an animal’s membrane “buffer”. Helps keep membrane fluid at high and low temperatures.

11. Membrane Proteins
Define specific functions of a membrane (different cell = different proteins)
Integral proteins- penetrate hydrophobic core of lipid bilayer *integrated within
Peripheral proteins- not embedded at all- “appendages” *off to sides

13. 6 Functions of proteins in membrane

15. Membrane Carbohydrates

16. Membrane Carbohydrates

18. Selective Permeability

19. 9/12/18
GET A LAPTOP
Complete Parts #1-4 of Ch. 7 Cellular Transport Questions with animations ( 25 mins)
Log off, return laptop to cart, and show me work to sign off!

20. Water, glucose, charged ions (polar)
CO2, O2,
(small nonpolar)
Water, glucose, charged ions (polar)

21. PASSIVE TRANSPORT (Parts 1, 2, & 3)
PART 1:  Diffusion Animations ​a)  What is simple diffusion? b) How does the lump of sugar diffuse into the water? c) Is this a form of ACTIVE or PASSIVE TRANSPORT? PART 2:  Facilitated Diffusion a)  What is the role of the carrier proteins in this process? b) Where are the greatest number of particles in the beginning of the animation?  Where are they by the end? c) When is facilitated diffusion used over simple diffusion by a cell? d) Is this a form of ACTIVE or PASSIVE TRANSPORT?

22. PART 3: Osmosis a) Is osmosis a type of diffusion. Explain
PART 3:  Osmosis a)  Is osmosis a type of diffusion? Explain. b) What is a solute?  How does it relate to the tonicity of water in cells? c) What happens to a cell in a hypertonic solution?  Hypotonic?  Isotonic?

23. Passive transport

24. Passive transport

25. Isotonic
A solution with an equal solute concentration compared to another solution.
3% Na
97% H2O
solution
3% Na
97% H2O
Red Blood Cell

26. Passive transport Animal (cont.)

27. Hypertonic
A solution with a greater solute concentration compared to another solution.
5% NaCl
95% H2O
solution
3% NaCl
97% H2O
Red Blood Cell

28. Hypotonic
A solution with a lower solute concentration compared to another solution.
1% Na
99% H2O
solution
3% Na
97% H2O
Red Blood Cell

30. Be able to make predictions on which direction the water molecules will MOVE AND what will happen to the cell!

31. Let’s Practice! What type of solution is the cell in?
What will happen to the cell? WHY?
HYPOTONIC- Water will move into cell, causing it to expand, possibly LYSE!
15% Glucose
solution
40% Glucose
Red Blood Cell
60% Water
85% Water

32. Passive transport

33. Plasmolysis
Animations

34. Passive transport

35. ACTIVE TRANSPORT
PART 4:  Active Transport a)  What is the role of the Na+/K+ protein pump in cells? b) Where are the greatest number of Na+ particles in the beginning of the animation?  Where are they (Na+)  by the end? c) Where are the greatest number of K+ particles in the beginning of the animation?  Where are they (K+)  by the end? d)  Why is ATP used in this animation?   Is this a form of ACTIVE or PASSIVE TRANSPORT? e) Describe the process of how a bacterium is engulfed. Where does the endocytosis and exocytosis occur in the animation? f)  Is this a form of ACTIVE OR PASSIVE TRANSPORT?

36. Active transport

37. Active transport

38. Membrane potential

39. Membrane potential

40. Sodium/ Potassium pump
ATP NEEDED!

41. Active transport

42. Bulk Transport

44. Endocytosis

46. Familial Hypercholesterolemia