LIPIDS L 3 BIOLOGY SOME FACTS ABOUT LIPIDS

LIPIDS L 3 BIOLOGY

SOME FACTS ABOUT LIPIDS… n Made of carbon, hydrogen, and oxygen (like carbohydrates!) n Much lower number of oxygen atoms in lipids than in carbohydrates n Include substances like fats, oils, waxes n EXAMPLE: C 51 H 98 O 6

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

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

GLYCEROL (C 3 H 8 O 3)

2 types of FATTY ACIDS

LIPID

How are Lipids made?

Dehydration synthesis to form lipids: n http: //www 2. nl. edu/jste/lipids. htm

Some Lipid molecules have DUAL personalities! One end of Phospolipid mol is Hydrophobic (H 20 hating) and the other is Hydrophilic (H 20 loving). n Guess which end is which?

HOW DO YOU LIKE YOUR LIPIDS? n SATURATED – The fatty acids are completely full of hydrogen atoms n UNSATURATED – There are one or more double bonds, making the fatty acids not full of hydrogens

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

OK in moderation…. . n SATURATED FATS = “BAD FATS” – Usually solid, fully hydrogenated - animal

The Bad. …. . n Trans fats – Unsaturated, but the double bond between carbons is turned so they are now SOLID at room temperature – Considered “bad” fats

SATURATED, TRANS or UNSATURATED?

Cholesterol- also a Lipid!

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

Watch the film about Lipids. http: //www. learner. org/resources/series 61. ht ml? pop=yes&vodid=488124&pid=813#

NOTES QUIZ! 1. What are the four parts that make up a lipid? 2. What is the difference between a saturated fat and an unsaturated fat? 3. How are lipids like carbohydrates? (2 similarities) 4. How are lipids different from carbohydrates? (2 differences)

5. Do you consider a Lipid a Biopolymer or not? JUSTIFY your answer. 6. List 3 functions of lipids.