Biology 1202B Chapter Notes - Chapter 5: Fluid Mosaic Model, Lipid Bilayer, Transmembrane Protein

• School: Western University
• Department: Biology
• Course: Biology 1202B
• Professor: Jennifer Mc Donald

Document Summary

5. 1 an overview of the structure of membranes. Plasma membrane is semi permeable and allows for uptake of key nutrients and elimination of wastes. 5. 1a a membrane consists of proteins in a fluid of lipid molecules. Fluid mosaic model: model proposes that membranes are not too rigid with molecules locked in place but rather consist of proteins that move around within a mixture of lipid molecules that have the consistency of olive oil. Lipid molecules in a membrane exist in a double layer called a bilayer. Lipid molecules of bilayer vibrate, flex back and forth, spin around their long axis, move sideways, and exchange places fluid. Made of many dif. types of proteins mosaic. B/c they are larger, proteins do not move as fast in the fluid environment of the membrane glycolipids and glycoproteins: carbohydrate groups linked to the lipids and proteins of a membrane. Membrane asymmetry: -one half of the bilayer is different than other half.