Which of following is a trisaccharide?
1. kestose
2. cellobiose
3. trehalose
4. mannose

Detailed Explanation:
Correct Answer:

1. Kestose

What Is a Trisaccharide?

A trisaccharide is a type of oligosaccharide that consists of three monosaccharide units (sugar molecules) linked together by glycosidic bonds. These sugar units can be the same or different. Trisaccharides are found in various plants and foods and serve a variety of functions, such as energy storage or acting as sweeteners.

Explanation of Kestose:

Kestose is a trisaccharide made up of three fructose molecules. It is a type of fructooligosaccharide, commonly found in plants, particularly in onions, chicory, and other sources. Kestose can serve as a prebiotic, promoting the growth of beneficial gut bacteria.

Why Other Options Are Incorrect:

• Cellobiose (Option 2):
  Cellobiose is a disaccharide, not a trisaccharide. It consists of two glucose molecules linked by a beta-1,4-glycosidic bond, typically found in the cell wall structure of plants.

• Trehalose (Option 3):
  Trehalose is a disaccharide, not a trisaccharide. It is composed of two glucose molecules linked by an alpha-1,1-glycosidic bond and is commonly found in fungi, yeast, and insects as an energy source.

• Mannose (Option 4):
  Mannose is a monosaccharide, not a trisaccharide. It is a simple sugar that is an isomer of glucose and is often found in glycoproteins and glycolipids.

Conclusion:

In summary, Kestose is the correct example of a trisaccharide, made up of three fructose molecules. Understanding the structure and examples of oligosaccharides, such as trisaccharides, is essential in fields like biochemistry and nutrition. Kestose, along with other oligosaccharides, plays an important role in digestion and human health, particularly as a prebiotic.