1. Separating Dead from Alive
Cell Membranes
Separating Dead from Alive

2. Identify the radical below.
Amine
Hydroxyl
Carboxyl
Monosaccharide

3. Identify the molecule shown.
Butene
Propene
Propane
Butane
None of the above are a good response.

4. What is the function of the molecule shown below?
Energy storage
Component of cell membrane
Fuel source
Regulatory

5. I. Functions Living part of the cell-legitimate cell organelle
Separates living from the nonliving world
Semipermeable-regulates what enters and exits the cell
Partitions the cell into different regions where different functions take place
Participates in chemical reactions
Transmits signals between outside of cell and the cytoplasm[

6. II. Cell membrane characteristics
A. Semipermeable
B. Elastic
C. Wettable
D. Very thin-around 10 um

7. II. Early model A. Davison Danielli Model 1. mainly lipid
2. aqueous channels
3. surface protein
4. weaknesses

8. Phospholipids interacting in water-amphipathic

9. RBC cell membrane-clearly resembles Davson-Danielli model

10. III. Fluid mosaic model A. Main ingredients Phospholipids
Proteins both intrinsic and extrinsic
Cholesterol
Glycocalyx

11. Your textbook’s Diagram

12. B. Protein functions

13. What do you think the function of this membrane protein might be?
Transport
Cell to cell adhesion
Cell to cell recognition
Energy production

14. Electron micrograph of cell membrane

15. C. Chemical properties of membrane
1. Lateral fluidity
2. Two dimensional fluidity-rapid movement of lipids and proteins
3. Flexible
4. Self sealing
5. Can fuse

16. C. Chemical properties of membrane
Effect of saturated vs. unsaturated
Role of cholesterol

17. IV. Function of Cell Membrane-Passive Transport
A. Diffusion
1. definition
2. example
3. across cell membrane

18. Your textbook’s figure of diffusion

19. IV. Function of Cell Membrane-Passive Transport
B. Facilitated Diffusion
1. mediated by intrinsic protein
2. diffusion gradient-no ATP
3. glucose entrance into cell
4. boy scout analogy

20. C. Osmosis
1. Definition
2. U-tube
3. Explanation
4. Common examples
5. Terms of tonicity
6. Turgor pressure

21. In which direction will water move?
A => B and B rises
B => A and A rises
A  B and the sides stay at the same level
No idea

22. Your textbook’s figure of osmosis

23. Figure 5-13 Page 106 (a) Plasma membrane (b) Nucleus (c) Vacuole
Vacuolar
membrane
(tonoplast)
Figure 5-13 Page 106
Plasma
membrane
Cytoplasm

24. V. Function of cell membrane-active transport
A. Definition
B. Endocytosis
1. Phagocytosis

25. Phagocytic vesicles

26. Figure 5-19 Page 111 2. Pinocytosis Microvilli Pinocytotic vesicle
Cytosol
Figure 5-19 Page 111

27. 3. Receptor mediated pinocytosis
(b)
Figure 5-20b Page 112

28. C. Exocytosis

29. D. Membrane Pumps
Materials are moved against concentration gradient
An integral protein molecule is involved
ATP is necessary
Sometimes membrane potentials are produced
Na ion-K ion pump is an example

30. Figure 5-15b Page 108 (b) 2. A phosphate group is
ATP
ADP
2. A phosphate group is
transferred from ATP to
the transport protein
3. The transport protein under-
goes a conformational
change, releasing three
sodium ions outside the cell.
1. Three sodium ions bind
to the transport protein
4. Two potassium ions bind
to the transport protein
6. The transport protein
returns to its original shape:
Two potassium ions are
released inside the cell
5. The phosphate is released
Figure 5-15b Page 108
(b)