Which one of the following is a disaccharide? \[ \text{Glucose, Lactose, Amylose, Fructose} \]
Which one of the following is a disaccharide? \[ \text{Glucose, Lactose, Amylose, Fructose} \]
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Solution and Explanation
Monosaccharides, Disaccharides, and Polysaccharides
A disaccharide is a carbohydrate composed of two monosaccharide units joined by a glycosidic bond. Let's explore the components involved in this category.
Monosaccharides:
- Glucose is a monosaccharide, a simple sugar that serves as a primary source of energy for the body.
- Fructose is another monosaccharide, often found in fruits and honey.
Disaccharides:
- Lactose is a disaccharide made up of two monosaccharide units: glucose and galactose. It is commonly found in milk and is the sugar that gives milk its sweetness.
Polysaccharides:
- Amylose is a polysaccharide made up of long chains of glucose units. It is a component of starch, which is a storage form of glucose in plants.
Conclusion:
- Glucose and fructose are monosaccharides, meaning they are single sugar units. - Lactose is a disaccharide composed of two monosaccharides: glucose and galactose. - Amylose is a polysaccharide made up of multiple glucose units.
Summary:
Thus, out of the given options, lactose is the disaccharide, formed by the glycosidic bond between glucose and galactose.
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