5.3 summary

-Lipids are water avoiding compounds that are unable to mix with water, compounds like these are hydrophobic meaning "water fearing".

-Fat consists of a three carbon backbone called glycerol that is attached to three fatty acids.

-Saturated fat contains the maximum number of hydrogen atoms in all three fatty acid chains.

-Unsaturated fat contains less than the maximum number of hydrogen atoms in one or more f it's fatty acid chains because some of it's carbon atoms are double bonded.

-Steroids are lipid molecules which the carbon skeleton forms four fused rings, but steroids are different from fats in structure and funtion. Steroids go around your body and acts as chemical signals.

-Cholestrol is an essential molecule found in the membrane that surrounds your cells.

Picture of fatty foods, from http://upload.wikimedia.org/wikipedia/commons/7/74/McDonald's_French

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Concept Check
1.What property do lipids share?
Lipids are hydropholic meaning avoid water molecules.
2.What are the parts of a fat molecule?
A fat molecule consists of a three-carbon backbone called glycerol that is attached to three fatty acids.
3.Desribe two ways that steroids differ from fats.
Two ways that steroids differ from fats are that have different structures, steroids' carbon skeleton is a four fused ring structure, where as a fat is three carbon backbone. And steroids functions different from fats by working as chemical signals.
4.What does the term unsaturated fat on a food label mean?
The term unsaturated fat on a food label mean that they might be healthier than saturated fat foods.