4-Practice Problems Key - (c)Both are disaccharides, but...

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1. Lipids a. Draw the structure of a triglyceride. For example: H 2 C HC H 2 C O O C H 2 CH 3 O C H 2 CH 3 O C H 2 CH 3 O O 14 14 14 b. Draw the structure of dimyristoyl phophatidylserine. H 2 C HC H 2 C O O O C H 2 CH 3 O C H 2 CH 3 O H 2 O 12 12 P O O - O H 2 C C H NH 3 + OOO - Phosphatidylserine Glycerol Myristic acid 2. Membrane Fluidics When bacteria growing at 20°C are warmed to 30°C, are they more likely to synthesize membrane lipids with: a. saturated or unsaturated fatty acids? Explain. Saturated. b. short-chain or long-chain fatty acids? Explain. Long-chain. By increasing the proportion of saturated and long-chain fatty acids, which have melting temperatures, the bacteria will be able to maintain proper membrane fluidity at the higher temperature.
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3. Sugar structures (Lehninger, Ch. 7 #7) Describe the common structural features and differences for each pair: (a) cellulose and glycogen; (b) D-glucose and D-fructose; (c) maltose and sucrose. (a)Both are polymers of D-glucose, but they differ in the glycosidic linkage: ( β 1 4) for cellulose, ( α 1 4) for glycogen. (b)Both are hexoses, but glucose in an aldohexose, fructose a ketohexose.
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Unformatted text preview: (c)Both are disaccharides, but maltose has two ( 1 4)-linked D-glucose units; sucrose has ( 1 2 )-linked D-glucose and D-fructose. 4. Sugar configuration and conformation (Lehninger, Ch. 7 #5) Which bond(s) in -D-glucose must be broken to change its configuration to -D-glucose? Which bond(s) to convert D-glucose to D-mannose? Which bond(s) to convert one chair form of D-glucose to the other? To convert -D-glucose to -D-glucose, the bond between C-1 and the hydroxyl on C-5 must be broken and reformed in the opposite configuration (as in Fig. 7-6). To convert D-glucose to D-mannose, either the H or the OH on C-2 must be broken and reformed in the opposite configuration. Conversion between chair conformation does not require bond breakage; this is the critical distinction between configuration and conformation....
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4-Practice Problems Key - (c)Both are disaccharides, but...

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