1. Cell Membrane and Transport
Unit 4 Part 2
AP Biology, Mrs. Jensen

2. Cell Membrane Structure
Phospholipid bilayer
Proteins
Integral
Peripheral
Carbohydrates
Cholesterol

3. Phospholipid Bilayer

4. Proteins in the Cell Membrane
Carrier vs. Channel Protein

5. Simple Diffusion

6. Facilitated Diffusion

7. Facilitated Diffusion

8. Glucose Entering the Cell by Facilitated Diffusion

9. Regulation of Glucose Uptake by Insulin

10. Osmosis

11. Osmosis

12. When comparing two solutions…
Solute “Tonic” Concentration
Water Concentration
Hypotonic
Low “Hypo”
High
Hypertonic
High “Hyper”
Low
Isotonic
Same “Iso”
Same

13. Water always moves from HYPOTONIC (low solute, HIGH WATER) to HYPERTONIC (high solute, LOW WATER)

14. Freshman Bio – Always describing the solution outside the cell

17. AP Bio – Could be describing the solution outside OR inside the cell
AP Bio – Could be describing the solution outside OR inside the cell. IT’S A COMPARATIVE TERM!!

20. Another way to compare two solutions… “U-tube” problems
Grab a piece of scratch paper to draw these diagrams!
How “u-tubes” generally work:

21. #1

22. The solutions in the arms of a U-tube are separated at the bottom of the tube by a selectively permeable membrane. The membrane is permeable to sodium chloride but not to glucose At the beginning of the experiment, which side is hypertonic and which is hypotonic? 2.   If you examine side A after 3 days, you should find… (explain what has happened to each substance) #2

23. Osmosis in Real Cells

24. Paramecia and Contractile Vacuoles to Maintain Water Balance

25. Active Transport Using Protein Pumps

26. How ATP Provides Energy

27. Active Transport Using Protein Pumps: Na+ / K+ Pump

28. Active Transport Using Protein Pumps Example: H+/Sucrose Symporter

29. Active Transport: Endocytosis

30. Endocytosis

31. Active Transport: Exocytosis