Diaminopimelic acid and muramic acid occur in the wall of

Options

A. Bacteria
B. Fungi
C. Brown algae
D. Higher plants.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the occurrence of diaminopimelic acid and muramic acid in the cell wall of a specific organism.

2. **Identifying the Options**: The options provided are:
- Option 1: Bacteria
- Option 2: Fungi
- Option 3: Brown algae
- Option 4: Higher plants

3. **Analyzing Bacterial Cell Wall**: The bacterial cell wall is primarily composed of peptidoglycan, which is a polymer made up of sugars and amino acids. This structure is unique to bacteria.

4. **Components of Peptidoglycan**: Within the peptidoglycan, diaminopimelic acid and muramic acid are significant components.
- **Diaminopimelic Acid**: This is an amino acid that is found in the peptidoglycan layer of bacterial cell walls.
- **Muramic Acid**: This is a derivative of N-acetylmuramic acid, which is also a component of the peptidoglycan structure.

5. **Comparing Other Options**:
- **Fungi**: Fungal cell walls are primarily made of chitin, not peptidoglycan, so they do not contain diaminopimelic acid or muramic acid.
- **Brown Algae**: The cell walls of brown algae are composed of cellulose and alginates, lacking peptidoglycan.
- **Higher Plants**: Plant cell walls are primarily made of cellulose and do not contain peptidoglycan or its components.

6. **Conclusion**: Since diaminopimelic acid and muramic acid are specific to the bacterial cell wall, the correct answer is **Option 1: Bacteria**.

---