5.3

Lipids are compounds that avoid water. "Lipids surround and contain the watery contents of our cells, circulate in our bodies and send chemical signals to cells, and store energy in our bodies."(copyright.JunTakaki)
Fat - made up of carbon, backbone, glycerol.
Saturated fat-all three fatty acid chains have the maximum number of hydrogen atoms
Unsaturated Fat-has one or more fatty acid chains with molecules that don't bond with the maximum number of hydrogen atoms.
when lipids deposit, it may reduce the blood flow and cause a heart disease. One type of lipid is Steroids.
Steriods- molecules formed from carbon skeletons which make four fused rings. Has very different structure and funcition from fats. (eg.Cholesterol)
Concept Check
1.What property do lipids share?
The property that lipids share being hydrophobic.
2.What are the parts of a fat molecule?
The parts of a fat molecule are the glycerol three-carbon backbone.
3.Describe two ways that steroids differ from fat.
1)steroids differ from fats in the way they are structuredwhere one is four and one is three.
2)steroids differ from fats in the way that steroids are used as chemical signal in our body and fat doesn't.
4.What does the term unsaturated fat on a food label mean?
Unsaturated fat is probably more unhealthy than the saturated fat.