BIOL 200 Chapter Notes - Chapter 2: Carboxylic Acid, Fluorescence Recovery After Photobleaching, Sterol
Document Summary
Not all lipid bilayers are biological membranes ie: (cid:271)iologi(cid:272)al (cid:373)e(cid:373)(cid:271)ra(cid:374)es are(cid:374)"t phospholipid (cid:271)ilayers (cid:271)/(cid:272) they o(cid:374)ly (cid:373)ade of phospholipids. Synthetic lipid bilayers: single type of lipid (would be more permeable than biological) Have many types of lipids (glycolipids, sphingolipids & cholesterol) & proteins. Acts as a barrier that separates the environment from the inside of the cell. Lipid: organic molecule that is insoluble in water but dissolves readily in nonpolar organic solvents & are not extensible macromolecule (no oh group for monomer to be added) Neutral fats (triglycerides: 3 fatty acid + glycerol): responsible for energy storage material in cells but cannot form a membrane layer. Phospholipids: predominant lipids in membrane b/c amphipathic (hydrophobic region -fatty acid tails & hydrophilic regions-choline head that interacts w/ water) For lipid to function as membrane must associate w/ water & form stable sheets with water. Bilayer structure gives ability to develop sidedness: features that are specific to one side of membrane.
