1. LIPIDS
L3 BIOLOGY

2. SOME FACTS ABOUT LIPIDS…
Made of carbon, hydrogen, and oxygen (like carbohydrates!)
Much lower number of oxygen atoms in lipids than in carbohydrates
Include substances like fats, oils, waxes
EXAMPLE: C51H98O6

3. Properties & Function
Nonpolar, Hydrophobic molecules (water hating!)- why??
Functions:
Form Membranes!
Long-term energy storage
Hormones
Water proofing

4. Molecular structure of one type lipid
four parts –
one glycerol
three fatty acids
(called a triglyceride)

5. GLYCEROL (C3H8O3)

6. 2 types of FATTY ACIDS

7. LIPID

8. How are Lipids made?

9. Dehydration synthesis to form lipids:

10. Some Lipid molecules have DUAL personalities!
One end of Phospolipid mol is Hydrophobic (H20 hating) and the other is Hydrophilic (H20 loving).
Guess which end is which?

11. HOW DO YOU LIKE YOUR LIPIDS?
SATURATED
The fatty acids have ALL single bonds between Carbons, which are completely full of hydrogen atoms
UNSATURATED
There are one or more double bonds between Carbons, making the fatty acids not full of hydrogens

12. The Good in moderation…
UNSATURATED FAT = “GOOD FAT”
Usually a liquid; not fully hydrogenated from plants

13. OK in moderation….. SATURATED FATS = Small amounts in diet
Usually solid, fully hydrogenated - animal

14. The Bad .….. Trans fats: BAD fats
Unsaturated, but the double bond between carbons is turned so they are now SOLID at room temperature

16. SATURATED, TRANS or UNSATURATED?

17. Cholesterol- also a Lipid!

18. Why do we need Cholesterol?
Important part of cell membrane
Molecule body uses to make sex hormones:
Estrogen

19. What’s wrong with too many Lipids in the Diet?

20. Watch the film about Lipids.