BIOL 1010U Lecture Notes - Lecture 7: Triglyceride, Glycerol, Active Transport
Document Summary
Biol 1010 and biol 1011 - lecture 7. Chapter 5 (section 5. 1) structure of cell membranes (pages 90 to 94) Chapter 5 (section 5. 2) the plasma membrane and cell wall (pages 95 to 99) Use the following wireframe outline to make notes on the content presented in lecture 7. Long hydrocarbon chain bonded to a carboxyl group (hydrophobic) Major lipids found in cell membranes are phospholipids, which has a polar head (glycerol, phosphate, and polar group) Another major lipid found in cell membranes are cholesterols, which are amphipathic and can increase or decrease fluidity depending on temperature. At normal cell temperature, interaction of rigid structure of cholesterol with phospholipid fatty acid tails reduces the mobility of phospholipids and fluidity of membrane. At lower temperatures, cholesterol prevents phospholipids from packing tightly and increases membrane fluidity. Lower temperatures cause cell membranes to become rigid due to the slowing down of molecules, so cholesterol helps reverse this effect.
