Summary 5.3

Some liquids' inability to mix with water is similar to many other water-avoiding compounds to be called lipids. Molecules that avoid water is known as hydrophobic, a property that is evident in the boundary that surrounds and contains the aqueous contents of your cells. Fat consists of a three-carbon backbone attached to three fatty acids. Saturated fat is a fat in which all three fatty acid chains contain the maximum possible number of hydrogen atoms. Unsaturated fat contains less than the maximum numer of hydrogen atoms in in one or more of its fatty acid chains. Cholesterol is an essential molecule found in the membrame that is around your cells.

Images:
http://fig.cox.miami.edu/~cmallery/255/255chem/p2x2x3.jpg
(A brief overview and diagram of hydrophilic molecules.)

For more information:
http://en.wikipedia.org/wiki/Hydrophilic
(Information about the hydrophilic property)
http://www.dietobio.com/dossiers/en/fatty_acids/molecule.html
(A brief introduction to a Fat Molecule and its Components)

Content Check:
What property do lipids share?
Lipids are hydropholic that allows them to avoid water molecules.
What are the parts of a fat molecule?
A fat molecule consists of a three-carbon backbone called glycerol attached to three fatty acids.
Desribe two ways that steroids differ from fats.
Two ways that steroids differ from fats are that have different structures and functions.
What does the term unsaturated fat on a food label mean?
The term unsaturated fat on a food label mean that they might be healthy and can build up deposits of lipid known as plaques.