객관식
Which of the following disaccharides are reducing sugars?
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9. Carbohydrates
Reducing Sugars
객관식
Which of the following is a non-reducing sugar?
A
Maltose
B
Glucose
C
Lactose
D
Sucrose
검증된 단계별 안내1
Understand the concept of reducing and non-reducing sugars: Reducing sugars have a free aldehyde (-CHO) or ketone (-C=O) group that can participate in redox reactions. Non-reducing sugars lack such free groups due to glycosidic bond formation.
Examine the structure of sucrose: Sucrose is a disaccharide composed of glucose and fructose linked by a glycosidic bond between the anomeric carbons of both monosaccharides. This bond prevents the free aldehyde or ketone group from being available.
Compare sucrose with other sugars listed: Maltose and lactose are reducing sugars because they have a free anomeric carbon in one of their monosaccharide units. Glucose is a monosaccharide with a free aldehyde group, making it a reducing sugar.
Conclude why sucrose is non-reducing: The glycosidic bond in sucrose involves both anomeric carbons, effectively blocking the functional groups required for reduction reactions.
Apply this knowledge to similar problems: When identifying non-reducing sugars, always check if the glycosidic bond involves the anomeric carbons of the monosaccharides, as this is the key feature of non-reducing sugars.
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