The cell wall of brown algae is made up of

Options

A. Cellulose and chitin
B. Cellulose and peptidoglycan
C. Cellulose and algin
D. Cellulose and starch

Answer

**Step-by-Step Solution:**

1. **Identify the Type of Algae**: The question specifically asks about brown algae, which are scientifically classified as Phaeophyceae.

2. **Understand the Composition of Cell Walls in Algae**: Algae have different compositions in their cell walls depending on their type. For brown algae, we need to identify the specific components that make up their cell wall.

3. **Review the Options Provided**: The options given are:
- A) Cellulose and chitin
- B) Cellulose and peptidoglycan
- C) Cellulose and algin
- D) Cellulose and starch

4. **Analyze Each Option**:
- **Option A (Cellulose and chitin)**: Chitin is primarily found in the cell walls of fungi, not algae. Therefore, this option is incorrect.
- **Option B (Cellulose and peptidoglycan)**: Peptidoglycan is a component of bacterial cell walls, not algae. Hence, this option is also incorrect.
- **Option C (Cellulose and algin)**: This option includes cellulose, which is a common component in the cell walls of many algae, and algin, which is a polysaccharide specifically found in brown algae. This option is likely correct.
- **Option D (Cellulose and starch)**: Starch is a storage carbohydrate and not a structural component of cell walls. Therefore, this option is incorrect.

5. **Conclusion**: After analyzing all the options, the correct answer is **C) Cellulose and algin**. The cell wall of brown algae is primarily made up of cellulose and algin.

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