Hydrophobic-water-fearing or water-avoiding
A fat consists of a three-carbon backbone called glycerol attached to three fatty acids, which contain long hydrocarbon chains.
*Some fats are solid at room temperature, other fats called oils are liquids at room temperature.
Two kinds of Fat:
1. Saturated fat-a fat in which all three fatty acid chains contain the maximum possible number of hydrogen atoms. *It is solid in room temperature.
2. Unsturated fat-a fat that one or more of its fatty acid chains contains less than the maximum number of hydrogen atoms because some of its carbon atoms are double-bonded to each other.
Steroids-a lipid molecule in which the carbon skeleton forms four fused rings.
* The best-knkown steroid is Cholesterol.
Cholesterol-an esential molecule found in the membranes that surround your cells.
*It is also the starting point from which your body produces other steroids.
Concept Check 5.3:
1. What property do lipids share?
Hydrophobic(water-fearing).
2. What are the parts of a fat molecule?
A fat consists of a three-carbon backbone called glycerol attached to three fatty acids(containing long hydrocarbon chains) and if all three fatty acid chains contain the maximum possible hydrogen number, it is saturated. If one or more of three fatty acid chains contain less than the maximum hydrogen number, it is unsaturated.
3. Describe two ways that steroids differ from fats.
1. All steroids have a core set of four rings.
2. Some steroids circulate in your ody as chemial signals.
4. What does the term unsaturated fat on a food label mean?
An unsaturated fat contains less than the maximum number of hydrogen atoms in one or more of its fatty acid chains because soe of its carbon atoms are double-bonded to each other.
The fats in fruits, vegetales, and fish are generally unsaturated, as are crn oil, olive oil, and other vegetabl oils.
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