BIOL 1010 Lecture Notes - Transmembrane Protein, Cellular Respiration, Integral Membrane Protein
Document Summary
Structure: membrane models, fluid mosaic of lipids, proteins, and carbohydrates, selective permeability, passive transport. The plasma membrane is the boundary that separates the living cell from its nonliving surroundings. Membranes are of crucial importance to life, because a cell must spate itself from the outside environment for two major reasons. It must keep its molecules of life (dna, rna. It must keep out foreign molecules that damage or destroy the cells components and molecules: membrane models. Two generations of membrane models: a) the davidson-danielli model. Widely accepted until 1970: b) the fluid mosaic model disperses the proteins and immerses them in the phospholipid bilayer, which is in a fluid state. Proteins are individually embedded in the phospholipid bilayer, rather than forming a solid coat spread upon the surface. Hydrophilic portions of both proteins and phospholipids are maximally exposed to water resulting in a stable membrane structure. Hydrophobic portions of proteins and phospholipids are in the nonaqueous environment inside the bilayer.
