Tunicin is

Options

A. Lipopolysaccharide
B. Cellulose like polysaccharide
C. Non - cellulosic polysaccharide
D. Proteinaceous

Answer

### Step-by-Step Solution:

1. **Understanding Tunicin**: Tunicin is a substance found in tunicates, which are marine animals belonging to the subphylum Urochordata within the phylum Chordata.

2. **Identifying the Nature of Tunicin**: Tunicin is described as a polysaccharide. Polysaccharides are long chains of sugar molecules that serve various structural and energy storage functions in living organisms.

3. **Classifying Tunicin**: Among the options provided (lipopolysaccharide, cellulose-like polysaccharide, non-cellulosic polysaccharide, proteinaceous), tunicin is specifically classified as a cellulose-like polysaccharide. This means it has a structure similar to cellulose, which is a common polysaccharide found in the cell walls of plants.

4. **Eliminating Incorrect Options**:
- **Lipopolysaccharide**: This is a complex of lipids and polysaccharides found in the outer membrane of Gram-negative bacteria, which does not relate to tunicin.
- **Non-cellulosic Polysaccharide**: Since tunicin is cellulose-like, this option is incorrect.
- **Proteinaceous**: This term refers to substances made primarily of proteins. Tunicin is not made of proteins, making this option incorrect as well.

5. **Conclusion**: Therefore, the correct classification of tunicin is as a cellulose-like polysaccharide.

### Final Answer:
Tunicin is a cellulose-like polysaccharide.

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