Identify the sulphur-containing amino acid?

Options

A. Proline
B. Methionine
C. Aspartic acid
D. Tryptophan

Answer

To identify the sulfur-containing amino acid from the given options (proline, methionine, aspartic acid, and tryptophan), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Amino Acids**: Amino acids are organic compounds that serve as the building blocks of proteins. Each amino acid has an amino group (-NH2), a carboxyl group (-COOH), and a unique side chain (R group).

2. **Identify the Options**: The options provided are:
- Proline
- Methionine
- Aspartic acid
- Tryptophan

3. **Check for Sulfur Content**: We need to determine which of these amino acids contains sulfur in its structure.
- **Proline**: This amino acid does not contain sulfur.
- **Methionine**: This amino acid contains a sulfur atom in its side chain.
- **Aspartic acid**: This amino acid does not contain sulfur.
- **Tryptophan**: This amino acid does not contain sulfur.

4. **Conclusion**: Among the given options, only methionine contains sulfur.

### Final Answer:
The sulfur-containing amino acid is **methionine**.

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