Transcript Chapter 15 Lipids

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