fall 2004 part 2

fall 2004 part 2 - Name ______ KEY _ 6 4. (25) a. (2) In...

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Unformatted text preview: Name ______ KEY _ 6 4. (25) a. (2) In the monosaccharide derivatives known as alditols (sugar alcohols), the aldehyde group is reduced to CH 2 OH. Give the appropriate common name of the sugar alcohol derived from D-glyceraldehyde. ______ glycerol ____ ____________ b. (1) The number of stereoisomers of the open chain form of a monosaccharide is (greater, lower , or same as ) the number of stereoisomers of the cyclic form. [circle one} c. (6) The Fisher Projection of D-altrose is shown below. 1) Give the class name that describes this particular size and type of monosaccharide. __ aldohexose ___ 2) How many pairs of enantiomers belong to the class you named? _____ 8 pairs ___________________ 3) Draw the Fisher Projection of L-altrose in the box below. CHO H HO OH H OH H OH H CH 2 OH CHO H H OH H OH H OH H CH 2 OH O d. (10) You discover a branched polysaccharide composed entirely of D-altrose. The main chain linkages are 〈 (1-3), and the branches are formed by 〈 (1-4) linkages. The skeleton of a small segment of this polysaccharide is shown below. Fill in all substituents, including hydrogens, showing the appropriate configuration around each carbon and all appropriate glycosidic bonds. Note that the top two residues belong to a branch chain and the bottom three belong to the “main” chain that has the reducing end. Name ______ KEY _ 7 Name ______ KEY _ 8 5. (21) a. (3) The hydrophobic effect tends to result in the formation of micelles by fatty acids and lipid bilayers or liposomes by phospholipids and sphingolipids. Why don’t the latter two types of compounds tend to form micelles like fatty acids do? [40 words max] The hydrophobic portion of each of these lipids consists of two long hydrocarbon chains, which will not fit into the spherical micelle structure due to steric hindrance. b. b. (5)1 )Name the family of compounds specifically used for long-term energy storage in animals. _ triacylglycerols __ 2) The advantages of this family of energy storage compounds over other energy storage compounds are: __ b, c ________ (a) More energy can be released per unit time relative to other compounds. (a) More energy can be released per unit time relative to other compounds....
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This test prep was uploaded on 04/10/2008 for the course CHEM 153A taught by Professor Staff during the Spring '05 term at UCLA.

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fall 2004 part 2 - Name ______ KEY _ 6 4. (25) a. (2) In...

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