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

The objective is to identify the disaccharide from the choices provided: Glucose, Lactose, Amylose, and Fructose.

1. Definition of Disaccharides:
Disaccharides are carbohydrates comprised of two monosaccharide units linked by a glycosidic bond. Examples of common disaccharides are sucrose, lactose, and maltose. Hydrolysis can break these sugars down into their constituent monosaccharides.

2. Analysis of Choices:
- Glucose: This is a monosaccharide, not a disaccharide. It is a simple sugar essential as an energy source for living organisms. - Lactose: This is a disaccharide, formed from one molecule of glucose and one molecule of galactose. It is a principal sugar found in milk. - Amylose: This is a polysaccharide, a component of starch, consisting of extended chains of glucose units. It is not a disaccharide. - Fructose: This is a monosaccharide, not a disaccharide. It is a common sugar found in fruits, used as a sweetener.

3. Conclusion:
Of the options presented, Lactose is the disaccharide.