Which of the following is not a storage polysaccharide?

Options

A. Starch
B. Glycogen
C. Inulin
D. Cellulose

Answer

To determine which of the following options is not a storage polysaccharide, we can follow these steps:

### Step 1: Understand the Definition of Storage Polysaccharides
Storage polysaccharides are complex carbohydrates that serve as energy reserves in organisms. They can be broken down into simpler sugars when energy is needed.

### Step 2: Identify Common Storage Polysaccharides
The most common storage polysaccharides include:
- **Starch**: Found in plants, it serves as a major energy reserve.
- **Glycogen**: Found in animals, it is a highly branched polysaccharide that stores energy.
- **Inulin**: A storage polysaccharide found in some plants.

### Step 3: Identify Structural Polysaccharides
In contrast to storage polysaccharides, structural polysaccharides provide support and structure to cells. The most notable example is:
- **Cellulose**: It is a major component of plant cell walls and provides structural support.

### Step 4: Analyze the Options
Given the options, we need to identify which one does not serve as a storage polysaccharide. Based on our understanding:
- **Starch**: Storage polysaccharide (plant).
- **Glycogen**: Storage polysaccharide (animal).
- **Inulin**: Storage polysaccharide (plant).
- **Cellulose**: Not a storage polysaccharide, but a structural polysaccharide.

### Conclusion
The correct answer is **Cellulose**, as it is not a storage polysaccharide.

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