Which of the following is known as animal cellulose?

Options

A. Chitin
B. Tunicin
C. Glycogen
D. Myosin

Answer

To answer the question "Which of the following is known as animal cellulose?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand Cellulose**:
- Cellulose is a polysaccharide that forms the cell wall of plants. It is composed of glucose units and provides structural support to plants.

2. **Identify the Options**:
- The question provides several options, which we need to evaluate to find out which one is referred to as "animal cellulose".

3. **Evaluate Each Option**:
- **Chitin**: This is a polysaccharide found in the exoskeletons of arthropods and in the cell walls of fungi. Since it is not found in animals, it cannot be considered animal cellulose.
- **Tunicin**: This is a polysaccharide found in the tunic of tunicates, which are marine animals. Tunicin has a structure similar to cellulose, which is why it is referred to as animal cellulose.
- **Glycogen**: This is a storage polysaccharide in animals, used for energy storage, not for structural purposes. Therefore, it cannot be classified as animal cellulose.
- **Myosin**: This is a protein involved in muscle contraction and does not provide structural support like cellulose. Thus, it is not animal cellulose.

4. **Conclusion**:
- The correct answer is **Tunicin**, as it is the polysaccharide that serves a similar structural role in animals as cellulose does in plants.

### Final Answer:
**Tunicin** is known as animal cellulose.

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