Which one is polysaccharide ?

Options

A. Lactose
B. Glycogen
C. Sucrose
D. Maltose.

Answer

To determine which of the given options is a polysaccharide, we need to understand the definitions and characteristics of the different types of carbohydrates. Here’s a step-by-step solution:

### Step 1: Understand the Types of Carbohydrates
Carbohydrates are classified into three main categories: monosaccharides, disaccharides, and polysaccharides.
- **Monosaccharides** are the simplest form of carbohydrates (e.g., glucose, fructose).
- **Disaccharides** consist of two monosaccharide units linked together (e.g., sucrose, lactose, maltose).
- **Polysaccharides** are long chains of monosaccharide units (e.g., starch, glycogen, cellulose).

### Step 2: Analyze Each Option
Now, let’s analyze each option provided in the question:

1. **Lactose**:
- Lactose is a disaccharide composed of glucose and galactose.
- Therefore, it is not a polysaccharide.

2. **Glycogen**:
- Glycogen is a polysaccharide that serves as the storage form of glucose in animals.
- It is made up of multiple glucose units linked together.
- Thus, glycogen is a polysaccharide.

3. **Sucrose**:
- Sucrose is also a disaccharide formed from glucose and fructose.
- Hence, it is not a polysaccharide.

4. **Maltose**:
- Maltose is another disaccharide made up of two glucose units.
- Therefore, it is not a polysaccharide.

### Step 3: Conclusion
After analyzing all the options, we find that the only polysaccharide among the choices is **glycogen**.

### Final Answer:
**Glycogen** is the polysaccharide.

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