Question

Which one of the following is a disaccharide? \[ \text{Glucose, Lactose, Amylose, Fructose} \] 

Hint:

Disaccharides are made up of two monosaccharides joined by a glycosidic bond. Lactose is an example of a disaccharide.

Answer 1

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.