1. Lipids Name___________

2. Lipids Made of C, H, O Very Little Oxygen! Organic
Cannot dissolve in water

3. Lipids Examples Triglycerides Waxes Phospholipids Steroids Fats & oils
Major source of lipids in our diet
Waxes
Phospholipids
Cell membranes
Steroids
cholesterol
hormones
Testosterone & estrogen

4. Lipids Functions: energy storage Long term – very concentrated
twice the energy as carbohydrates!
cell membrane
forms a boundary around the cell
cushions and protects organs
water repellent
coating on leaves, skin
insulates body
think whale blubber!

5. Triglyceride = 3 fatty acids + 1 glycerol
not a true monomer or polymer = just a “macromolecule”
general O I L
F A T

6. Fatty Acids: Saturated or Unsaturated

7. OILS Triglyceride with unsaturated fatty acids
Usually from plant sources
Better dietary choice
Liquid at room temperature
Examples: olive oil, corn oil, fish oil

8. FATS Triglyceride with saturated fatty acids
Usually from animal sources
Less healthy for your heart
Can clog your arteries
Solid at room temperature
Examples: Butter, fatty meats, lard

9. Saturated vs. unsaturated

10. Steroids Lipids with a unique 4-ring structure
Other lipids in biology
Steroids Lipids with a unique 4-ring structure
NOT: “Anabolic Steroids”! (Drugs used to mimic testosterone)

11. Cholesterol good molecule in animal cell membranes
can make hormones from it
Cholesterol is not necessary in our diet because our liver can make it. Too much cholesterol in blood may lead to atherosclerosis

12. Other lipids in biology
Phospholipids
Important part of all cell membranes
A phospholipid is made of a phosphate “head”, a glycerol, and 2 fatty acid “tails”
heads are on the outside touching water
They “like” water
tails are on inside away from water
They are “scared” of water
forms a barrier between the
inside/outside of a cell. H E A D T I L S

13. Cell Membrane = boundary to control what enters/leaves cell