BI110 Chapter Notes - Chapter 17: Structural Stability, Fluid Mosaic Model, Extremophile
Document Summary
Fluid mosaic: motion and varied units, hydrophobic molecules such as lipids serve as barrier to water, both inner and outer surfaces must remain stable, therefor hydrophilic, phospholipids foundation. Integral membrane proteins: proteins permanently in phospholipid bilayer, amphipathic, gatekeeper allowing materials to pass in and out of the cell receive signals from environment or other cells. Peripheral membrane proteins: hydrophilic molecules associated with plasma membrane, not permanently bound, bound to molecules embedded in the membrane, can be associated with extracellular side or intracellular side of membrane. Sterols: components of membrane, cholesterol, help maintain proper fluidity and stability. Facilitate the movement of materials in and out of the cell. Serve as a gate across the membrane: only target substance can move through the protein gate, protein ensures that the molecule moves in the right direction. Receptor proteins: receive and bind outside signalling molecules, recognize variety of signal from environment. Glycoproteins: carbohydrate protein complexes that can be used to identify cells.
