SWBAT: 1. Describe the

characteristics of glycerophospholipids

SWBAT: 1. Describe the

characteristics of glycerophospholipids

Chapter 1515.5 Glycerophospholipids

Chapter 1515.5 Glycerophospholipids

What are 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

GlycerophospholipidsTriglycerides

Amino AlcoholsAmino Alcohols

• Three amino alcohols found in glycerophospholipids are:

choline ethanolamine serine

LecithinsLecithins

• Lecithins contain choline• Fatty Acids can be same,

different, saturated, unsaturated or mixture

• Abundant in:•brain tissue•nerve tissue•egg yolks •wheat germ

•yeast

CephalinsCephalins

• Cephalins contain ethanolamine and sometimes serine

• Abundant in:•brain tissue•nerve tissue•egg yolks •wheat germ

•yeast

Polar?Polar?

• 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”

• Hydrophobic Tails

• Hydrophilic Head Group

Polar and Nonpolar RegionsPolar and Nonpolar Regions

• Most abundant in lipids in cell membrane

Nonpolar Tails

Polar Head

HomeworkHomework

Chapter 15.5Pg 515#15.38 – 15.42

SWBAT: 1. Describe the

composition and function of the lipid bilayer in cell membranes

SWBAT: 1. Describe the

composition and function of the lipid bilayer in cell membranes

Chapter 1515.7 Cell MembranesChapter 15

15.7 Cell Membranes

Cell MembraneCell Membrane

• Composed of phospholipid bilayer

• Polar head & nonpolar tails• Semipermeable – items can

enter and leave

Lipid BilayerLipid Bilayer

• Double row arrangement of phospholipids

• Hydrophilic polar heads align on outer edges of membrane

• Hydrophobic nonpolar tails move to center

Fluid Mosaic ModelFluid Mosaic Model

• Lipid bilayer contains unsaturated Fatty Acid

• Cis double bonds causes a non-rigid structure

• In liquid like bilayer:• Proteins• Carbohydrat

es• Cholesterol

HomeworkHomework

Chapter 15.7Pg 524 – 525 #15.56 – 15.62