Lipids include fats and sterioids

Characterisitcs of Lipids
lipids: oil's inability to mix with water that is typical of the class of water avoiding compounds
hydrophobic: water -avoiding molecules; meaning water fearing
- important funtion of lipids


Fats
Fat: 3-carbon backloon, called glycerol attahed to three fatty acids which contain long hydrocarbon chains
- some fats= solid in room temp.
- storing energy for later use, fatty tissues ushion your organs&provide body with insulation
Saturated fat: a fat in which all three fatty acd chains contain maximum possible number of hydrogen atoms.
Unsaturated fat: contains less than the maximum number of hydrogen atoms in one or more of its fatty acid chains
- diet rich in saturated fat-unhealthy
Steroids
Steriods: a lipid molecule in which the carbojn skeleton forms four fused rings
-all steroids have four rings; diff. inds and location of functional group
-classified as lipids

Small differences in functional groups
-variation cause major diff. appearance between men & women
cholestral: essential molecule found in the membranes that surround cells
-starting point of proliving other steroids inbody
- despite neccesity, has bad reputation


Concept Check
1. What property do lipids share?
The property of lipid
2. What are the parts of a fat molecule?
3. Describe two ways that steroids differe from fats.
4. What does the term unsaturated fat on a food label means?