Which of the following fibres is the odd man out?

Options

A. Cellulose
B. Fibrin
C. Collagen
D. Keratin

Answer

To determine which fiber is the odd one out among cellulose, fibrin, collagen, and keratin, we can analyze the nature of each fiber:

1. **Identify the fibers**:
- Cellulose
- Fibrin
- Collagen
- Keratin

2. **Classify each fiber**:
- **Cellulose**: This is a polysaccharide, which means it is a carbohydrate made up of repeated units of glucose linked by beta 1,4 glycosidic bonds.
- **Fibrin**: This is an insoluble protein that plays a crucial role in blood clotting.
- **Collagen**: This is a structural protein that provides strength and support to various tissues in the body, composed mainly of amino acids like glycine and proline.
- **Keratin**: This is also a protein, known for its protective properties, found in hair, nails, and skin.

3. **Compare the classifications**:
- Out of the four fibers, three (fibrin, collagen, and keratin) are proteins, while one (cellulose) is a polysaccharide.

4. **Conclusion**:
- Since cellulose is the only fiber that is not a protein, it is the odd one out.

**Final Answer**: The odd one out is cellulose because it is a polysaccharide, whereas the others are proteins.

---