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Lipid Learning Activity

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					Lipid Learning Activity
Honors Biology
I.      Lipids are fats and oils. They made up of two small “building blocks”, or chemical molecules
        called glycerol and fatty acids. Below is the structural formula of glycerol.




     1. What elements are present in the picture of glycerol shown above?


     2. Are there any elements in glycerol that are not in carbohydrates?   Y     N
     3. Using the picture above, what is the simple formula for glycerol? (add the number of atoms of each
        element)       C___H___O___
     4. Are there two times as many hydrogen atoms as oxygen atoms in glycerol? Y      N

The second kind of molecule that is part of a lipid is a fatty acid. Below are the structural formulas of 2
types of fatty acids.




     5. What elements are present in both types of fatty acids?
     6. Refer to the structural formulas on page 3. What is the simple formula for:
            a. Butyric acid? C___H___O___
            b. Caproic acid? C___H___O___
            c. Lauric acid? C___H___O___
     7. How do the number of hydrogen atoms compare to the number of oxygen atoms in each fatty acid?


     8. How many oxygen atoms are present in each fatty acid?




     9. What is a similarity between glycerol and fatty acids?
II. A fat molecule consists of one glycerol and three fatty acid molecules.
->Cut out the glycerol and THREE fatty acids from page 3. CUT ALONG SOLID LINES ONLY!!!**

 10. Will the lipid fit together like pieces in a puzzle?   Y      N
 11. What needs to be removed for the glycerol and fatty acids to fit together?

Remove three –OH ends from the glycerol molecule and three –H ends from the fatty acids. Join the molecules
to form a lipid and tape it below.




   12. How many glycerol molecules are needed to form a lipid molecule?
   13. How many fatty acid molecules are needed to form a lipid molecule?

       ->Join the leftover –H and –OH ends from your model and tape them below.




   14. What chemical substance is formed when the –OH and –H ends are joined?


   15. How many water molecules are formed when one lipid molecule is produced?




   16. A change in a type of fatty acid results in a whole different type of lipid. What molecule remains
       unchanged in all lipids?

				
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posted:11/11/2011
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