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.
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
Cell Membrane: Lipid-Bilayer Fluid Mosaic Model phospholipids
Plasma Membrane Fluid Mosaic Model resembles an ever-moving sea of fluid lipids that has large proteins bobbing along throughout the lipids
Membrane Lipids Phospholipids (~70% of membrane) Cholesterol: changes fluidity of membrane Glycolipids sugar molecule on lipid
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
Cell Membrane
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
Cell Wall
Cell Wall