which is odd

Options

A. chitin-carbohydrate
B. pectin-protein
C. steroid-lipid
D. wax-lipid

Answer

To determine which option is the odd one out among wax, steroids, chitin, and pectin, we can analyze each of these substances step by step.

### Step-by-Step Solution:

1. **Identify the Nature of Each Substance:**
- **Wax:** Wax is classified as a lipid. It is a long-chain non-polar lipid, which makes it hydrophobic and suitable for protective coatings.
- **Steroids:** Steroids are also lipids. They are synthesized in the smooth endoplasmic reticulum and include hormones like cortisol.
- **Chitin:** Chitin is a modified carbohydrate. It is a linear polymer made of N-acetyl-D-glucosamine and contains nitrogen. It is primarily found in the exoskeletons of arthropods.
- **Pectin:** Pectin is a carbohydrate. It is a polysaccharide made up of galacturonic acid and is commonly found in plant cell walls.

2. **Group the Substances:**
- **Lipids:** Wax and steroids are both lipids.
- **Carbohydrates:** Chitin and pectin are carbohydrates.

3. **Determine the Odd One Out:**
- Since wax and steroids are both lipids, and chitin and pectin are both carbohydrates, we need to identify which carbohydrate does not fit with the others.
- Chitin is a modified carbohydrate that has a structural role in organisms, while pectin is primarily a component of plant cell walls and serves a different function.

4. **Conclusion:**
- The odd one out is **pectin** because it is a carbohydrate that serves a different role compared to chitin, which is a structural carbohydrate found in the exoskeletons of arthropods.

### Final Answer:
**Pectin is the odd one out.**