Question

Which of the following is not polysaccharide?

• A. Ribose
• B. Starch
• C. Gum
• D. Glycogen

Hint:

Remember: ribose and glucose are monosaccharides, while starch, cellulose, and glycogen are polysaccharides.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Carbohydrates are classified based on the number of sugar units they produce upon hydrolysis: Monosaccharides (1 unit), Oligosaccharides (2-10 units), and Polysaccharides (many units).
Step 2: Formula Application:
1. Starch, Glycogen, Cellulose, Gums: Polysaccharides (Polymer of glucose/other sugars). 2. Ribose, Glucose, Fructose: Monosaccharides.
Step 3: Explanation:
Ribose is a pentose sugar (monosaccharide) found in RNA. It cannot be further hydrolyzed into smaller sugar units.
Step 4: Final Answer:
Ribose is a monosaccharide, not a polysaccharide.