LIPIDS L3 BIOLOGY.

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Presentation transcript:

LIPIDS L3 BIOLOGY

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

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

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

GLYCEROL (C3H8O3)

2 types of FATTY ACIDS

LIPID

How are Lipids made?

Dehydration synthesis to form lipids: http://www2.nl.edu/jste/lipids.htm

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?

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

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

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

The Bad .….. 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/series61.html?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 5. Do you consider a Lipid a Biopolymer or not? JUSTIFY your answer. 6. List 3 functions of lipids.