Lactose is a disaccharide formed by the formation of a _______ bond between glucose and ________. a. glycosidic; lactose b. glycosidic; galactose c. hydrogen; sucrose d. hydrogen; fructose
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Lactose on hydrolysis gives (a) glucose + galactose (b) fructose (c) fructose + glucose (d) glucose
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Galactose is a simple sugar formed when lactose, a carbohydrate in milk, is hydrolyzed. Individuals with galactosemia, a rare inherited disorder, lack an enzyme needed to metabolize galactose, and must avoid cow's milk and all products derived from cow's milk. Galactose is a stereoisomer of glucose (Problem 4.59). a. Draw both chair forms of galactose and label the more stable conformation. b. Which simple sugar, galactose or glucose, is more stable? Explain. c. Draw a constitutional isomer of galactose. d. Draw a stereoisomer of galactose that is different from glucose.
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