Sulphur containing amino acids are

Options

A. valine,lysine and cystine
B. tryptophan, glutamic acid, aspratic acid
C. citrulline, methionine and glumaric acid
D. cysteine, homocysteine, methionine

Answer

### Step-by-Step Solution:

1. **Identify the Question**: The question asks for sulfur-containing amino acids.

2. **List the Amino Acids**: The primary sulfur-containing amino acids are:
- Cysteine
- Homocysteine
- Methionine

3. **Explain the Relationship**:
- Cysteine and homocysteine are derived from methionine. This means that methionine can be converted into these two amino acids through metabolic pathways.

4. **Define Cysteine**:
- Cysteine is considered a semi-essential amino acid. This means that while the body can produce it, it can also be obtained from dietary sources.

5. **Discuss Methionine**:
- Methionine is another sulfur-containing amino acid and is important because it serves as a methyl group donor in various biological processes.

6. **Summarize the Answer**: Therefore, the sulfur-containing amino acids are cysteine, homocysteine, and methionine.

### Final Answer:
The sulfur-containing amino acids are cysteine, homocysteine, and methionine.

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