The amino acid found only in bacterial and blue - green algae is

Options

A. methionine
B. diamino - pimelic acid
C. aspartic acid
D. glutamic acid

Answer

To solve the question regarding which amino acid is found only in bacteria and blue-green algae, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organisms**: The question specifies that we are looking for an amino acid that is found only in bacteria and blue-green algae. Blue-green algae are also known as cyanobacteria, which are prokaryotic organisms.

2. **Recall the Kingdom**: Bacteria belong to the Monera kingdom, which consists of prokaryotic organisms. This includes both eubacteria and archaebacteria.

3. **List the Amino Acids**: The options provided are Methionine, Diaminopimelic Acid, Aspartic Acid, and Glutamic Acid. We need to determine which of these is unique to bacteria and blue-green algae.

4. **Analyze Each Amino Acid**:
- **Methionine**: This amino acid is found in both prokaryotes and eukaryotes, so it is not unique to bacteria and blue-green algae.
- **Aspartic Acid**: This amino acid is also found in both prokaryotes and eukaryotes, thus not unique.
- **Glutamic Acid**: Similar to aspartic acid, it is present in both groups.
- **Diaminopimelic Acid**: This amino acid is specifically found in the peptidoglycan layer of bacterial cell walls and is not found in eukaryotes.

5. **Conclusion**: After analyzing the options, the amino acid that is found only in bacteria and blue-green algae is **Diaminopimelic Acid**.

### Final Answer:
The amino acid found only in bacterial and blue-green algae is **Diaminopimelic Acid**.