1. WATER Hydrophilic head Hydrophobic tail WATER Figure 7.2
Figure 7.2 Phospholipid bilayer (cross section).

2. Phospholipid bilayer Hydrophobic regions of protein
Figure 7.3
Phospholipid bilayer
Figure 7.3 The original fluid mosaic model for membranes.
Hydrophobic regions of protein
Hydrophilic regions of protein

3. Figure 7.5
Fibers of extra- cellular matrix (ECM)
Glyco- protein
Carbohydrate
Glycolipid
EXTRACELLULAR SIDE OF MEMBRANE
Figure 7.5 Updated model of an animal cell’s plasma membrane (cutaway view).
Cholesterol
Microfilaments of cytoskeleton
Peripheral proteins
Integral protein
CYTOPLASMIC SIDE OF MEMBRANE

4. Mixed proteins after 1 hour
Figure 7.7
RESULTS
Membrane proteins
Mixed proteins after 1 hour
Mouse cell
Figure 7.7 INQUIRY: Do membrane proteins move?
Human cell
Hybrid cell

5. Unsaturated hydrocarbon tails Saturated hydrocarbon tails
Figure 7.8
Fluid
Viscous
Unsaturated hydrocarbon tails
Saturated hydrocarbon tails
(a) Unsaturated versus saturated hydrocarbon tails
(b) Cholesterol within the animal cell membrane
Figure 7.8 Factors that affect membrane fluidity.
Cholesterol

6. (b) Enzymatic activity (c) Signal transduction
Figure 7.10a
Signaling molecule
Receptor
Enzymes
ATP
Figure 7.10 Some functions of membrane proteins.
Signal transduction
(a) Transport
(b) Enzymatic activity
(c) Signal transduction

7. (d) Cell-cell recognition (e) Intercellular joining
Figure 7.10b
Glyco- protein
Figure 7.10 Some functions of membrane proteins.
(d) Cell-cell recognition
(e) Intercellular joining
(f) Attachment to the cytoskeleton and extracellular matrix (ECM)

8. Transmembrane glycoproteins
Figure 7.12
Secretory protein
Transmembrane glycoproteins
Golgi apparatus
Vesicle ER
ER lumen
Glycolipid
Figure 7.12 Synthesis of membrane components and their orientation in the membrane.
Plasma membrane:
Cytoplasmic face
Transmembrane glycoprotein
Extracellular face
Secreted protein
Membrane glycolipid

9. Membrane (cross section)
Figure 7.13a
Molecules of dye
Membrane (cross section)
WATER
Figure 7.13 The diffusion of solutes across a synthetic membrane.
Net diffusion
Net diffusion
Equilibrium
(a) Diffusion of one solute

10. (b) Diffusion of two solutes
Figure 7.13b
Net diffusion
Net diffusion
Equilibrium
Figure 7.13 The diffusion of solutes across a synthetic membrane.
Net diffusion
Net diffusion
Equilibrium
(b) Diffusion of two solutes

11. Lower concentration of solute (sugar) Higher concentration of solute
Figure 7.14
Lower concentration of solute (sugar)
Higher concentration of solute
Same concentration of solute
Sugar molecule
H2O
Selectively permeable membrane
Figure 7.14 Osmosis.
Osmosis

12. Hypotonic solution Isotonic solution Hypertonic solution
Figure 7.15
Hypotonic solution
Isotonic solution
Hypertonic solution
(a) Animal cell
H2O
H2O
H2O
H2O
Lysed
Normal
Shriveled
H2O
Cell wall
H2O
H2O
H2O
(b) Plant cell
Figure 7.15 The water balance of living cells.
Turgid (normal)
Flaccid
Plasmolyzed
Osmosis

13. 50 m Contractile vacuole Figure 7.16
Figure 7.16 The contractile vacuole of Paramecium caudatum.

14. Facilitated diffusion ATP
Figure 7.19
Passive transport
Active transport
Figure 7.19 Review: passive and active transport.
Diffusion
Facilitated diffusion
ATP

15. ATP   EXTRACELLULAR FLUID   H Proton pump H H H   H  H
Figure 7.20
ATP  
EXTRACELLULAR FLUID   H
Proton pump H H H   H  H
Figure 7.20 A proton pump.
CYTOPLASM 

16. Sucrose-H cotransporter
Figure 7.21
ATP H   H
Proton pump H H   H H H   H
Sucrose-H cotransporter
Diffusion of H
Figure 7.21 Cotransport: active transport driven by a concentration gradient.
Sucrose  
Sucrose

17. Receptor-Mediated Endocytosis
Figure 7.22
Phagocytosis
Pinocytosis
Receptor-Mediated Endocytosis
EXTRACELLULAR FLUID
Solutes
Pseudopodium
Receptor
Plasma membrane
Ligand
Coat proteins
Coated pit
“Food” or other particle
Coated vesicle
Figure 7.22 Exploring: Endocytosis in Animal Cells
Vesicle
Food vacuole
CYTOPLASM