1. Honors Biology Chapter 7Section 3 Cell Boundaries
SC B- 2.5: Explain how active, passive, and facilitated transport serve to maintain the homeostasis of the cell.

2. Cell Membrane surround all cells
is a thin, flexible barrier that acts like the cell’s “gate keeper”
made of lipid-bilayer
provides protection & support

3. Cell Membrane: Lipid-Bilayer
Fluid Mosaic Model
phospholipids

4. Plasma Membrane Fluid Mosaic Model
resembles an ever-moving sea of fluid lipids that has large proteins bobbing along throughout the lipids

5. Membrane Lipids Phospholipids (~70% of membrane) Cholesterol:
changes fluidity of membrane
Glycolipids
sugar molecule on lipid

6. Membrane Proteins Integral Proteins Peripheral Proteins
go all the way thru the membrane
channel proteins
receptor proteins
Peripheral Proteins
on inside or outside of membrane
+/- attached to integral proteins

7. Cell Membrane

8. Cell Walls found in: secreted by cell membrane
plant cells
fungi cells
algae
bacteria
secreted by cell membrane
allow O2, CO2, glucose, & H2O to pass through

9. Cell Wall

10. Cell Wall