Which is protein in nature?

Options

A. cellulose
B. terylene
C. polythene
D. silk and wool

Answer

To determine which option is protein in nature, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Analyze Cellulose:**
- Cellulose is a polysaccharide made up of linear chains of beta-1,4-D-glucose units.
- It consists of carbon, hydrogen, and oxygen atoms.
- It is the main component of the cell wall in plants and provides structural support.
- **Conclusion:** Cellulose is not proteinaceous; it is a carbohydrate.

2. **Analyze Terrylene:**
- Terrylene is a synthetic polymer created through the condensation polymerization of equimolar amounts of ethylene glycol and terephthalic acid.
- It is not related to proteins and is classified as a synthetic polymer.
- **Conclusion:** Terrylene is not proteinaceous; it is a synthetic polymer.

3. **Analyze Polythene:**
- Polythene (polyethylene) is a type of plastic made from the polymerization of ethylene.
- It belongs to the family of polyolefin resins and is used in various plastic products.
- **Conclusion:** Polythene is not proteinaceous; it is a synthetic plastic.

4. **Analyze Silk and Wool:**
- Wool fibers are primarily composed of proteins, specifically keratin.
- Silk fibers are made of fibroin, which is an insoluble protein.
- Both silk and wool are derived from animal sources and are proteinaceous in nature.
- **Conclusion:** Silk and wool are indeed proteinaceous.

### Final Answer:
The correct answer is **silk and wool**, as they are protein in nature.

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