Chapter Glycerophospholipids

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Presentation transcript:

Chapter 15 15.5 Glycerophospholipids SWBAT: 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 serine ethanolamine

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: 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

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