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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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- Spring '08