A unique amino acid in the cell wall of Bacteria and BGA is

Options

A. alanine
B. glutamine
C. aspartate
D. diaminopimelic acid

Answer

To answer the question about the unique amino acid in the cell wall of Bacteria and Blue-Green Algae (BGA), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Composition of Bacterial Cell Walls**:
- Bacterial cell walls are primarily composed of a polymer called peptidoglycan, which consists of sugars and amino acids.

2. **Identify the Sugars Involved**:
- The sugars that are significant in the structure of the bacterial cell wall include N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM).

3. **Identify the Amino Acids Present**:
- In addition to sugars, the cell wall contains amino acids that are crucial for its structure. One of the key amino acids found in the peptidoglycan layer is diaminopimelic acid (DAP).

4. **Confirm the Unique Amino Acid**:
- Among the amino acids mentioned, diaminopimelic acid is unique to the cell walls of bacteria and is not commonly found in the cell walls of other organisms.

5. **Conclusion**:
- Therefore, the unique amino acid in the cell wall of Bacteria and BGA is diaminopimelic acid (DAP).

### Final Answer:
The unique amino acid in the cell wall of Bacteria and Blue-Green Algae (BGA) is **diaminopimelic acid (DAP)**.