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Transcript
Chapter 15 15.5 Glycerophospholipids SWBAT: 1. Describe the characteristics of glycerophospholipids What are Glycerophospholipids? • Similar to triglycerides except one hydroxyl group is replaced by the ester of phosphoric acid and an amino alcohol • Bonded through a phosphodiester bond Triglycerides Glycerophospholipids Amino Alcohols • Three amino alcohols found in glycerophospholipids are: choline ethanolamine serine Lecithins • Lecithins contain choline • Fatty Acids can be same, different, saturated, unsaturated or mixture • Abundant in: • brain tissue • nerve tissue • egg yolks • wheat germ • yeast Cephalins • Cephalins contain ethanolamine and sometimes serine • Abundant in: • brain tissue • nerve tissue • egg yolks • wheat germ • yeast Polar? • Hydrophobic Tails • Hydrophilic Head Group • Contain both polar and nonpolar regions • Ionized alcohol and phosphate portion is called “the head” – Can hydrogen bond with water • Two Fatty Acids represent “the tail” Polar and Nonpolar Regions • Most abundant in lipids in cell membrane Polar Head Nonpolar Tails Homework Chapter 15.5 Pg 515 #15.38 – 15.42 Chapter 15 15.7 Cell Membranes SWBAT: 1. Describe the composition and function of the lipid bilayer in cell membranes Cell Membrane • Composed of phospholipid bilayer • Polar head & nonpolar tails • Semipermeable – items can enter and leave Lipid Bilayer • Double row arrangement of phospholipids • Hydrophilic polar heads align on outer edges of membrane • Hydrophobic nonpolar tails move to center Fluid Mosaic Model • Lipid bilayer contains unsaturated Fatty Acid • Cis double bonds causes a non-rigid structure • In liquid like bilayer: • Proteins • Carbohydrates • Cholesterol Homework Chapter 15.7 Pg 524 – 525 #15.56 – 15.62