Which of the following amino acid is mono amino dicarboxylic?

Options

A. Glycine
B. Lysine
C. Tyrosine
D. Aspartic acid

Answer

To determine which amino acid is mono-amino dicarboxylic, we need to analyze the structures of the given amino acids and identify their functional groups.

### Step-by-Step Solution:

1. **Understand the Terminology**:
- "Mono-amino" means there is one amino group (NH2).
- "Dicarboxylic" means there are two carboxylic acid groups (COOH).

2. **Identify the Amino Acids**:
- We will consider common amino acids such as glycine, aspartic acid, and tyrosine.

3. **Examine Glycine**:
- Glycine has the structure: NH2-CH2-COOH.
- It has one amino group (NH2) and one carboxylic group (COOH).
- Therefore, glycine is not mono-amino dicarboxylic.

4. **Examine Tyrosine**:
- Tyrosine has the structure: C6H4(OH)NH2COOH.
- It has one amino group (NH2) and one carboxylic group (COOH).
- Therefore, tyrosine is also not mono-amino dicarboxylic.

5. **Examine Aspartic Acid**:
- Aspartic acid has the structure: NH2-CH(CH2COOH)-COOH.
- It has one amino group (NH2) and two carboxylic groups (COOH).
- Therefore, aspartic acid is indeed mono-amino dicarboxylic.

6. **Conclusion**:
- The amino acid that is mono-amino dicarboxylic is **aspartic acid**.

### Final Answer:
The correct answer is **aspartic acid**.