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: https://www.youtube.com/watch?v=ESPNqKUluRs http://www.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? http://telstar.ote.cmu.edu/biology/MembranePage/index2.html

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

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

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

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

SATURATED, TRANS or UNSATURATED?

Cholesterol- also a Lipid!

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

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#