In protein synthesis, a polypeptide of five amino acids is synthesized. Which one of the followings can be the correct polypeptide?

Options

A. Lysine-methionine-valine-glycine-histidine
B. methionine-lysine-glycine-valine-histidine
C. valine-methionine-glycine-histidine-lysine
D. Glycine-valine-methionine-histidine-lysine

Answer

To determine which polypeptide sequence can be synthesized correctly, we need to follow the rules of protein synthesis, particularly focusing on the start codon and the order of amino acids.

### Step-by-Step Solution:

1. **Understand the Basics of Protein Synthesis**:
- Protein synthesis involves the translation of mRNA into a polypeptide chain of amino acids.
- The process starts with a specific codon known as the start codon, which is always Methionine (AUG).

2. **Analyze the Options**:
- We have four options for polypeptide sequences:
1. Lysine, Methionine, Valine, Glycine, Histidine
2. Methionine, Lysine, Glycine, Valine, Histidine
3. Valine, Methionine, Glycine, Histidine, Lysine
4. Glycine, Valine, Methionine, Histidine, Lysine

3. **Identify the Start Codon**:
- Since the synthesis of a polypeptide always begins with Methionine, we need to check which options start with Methionine.

4. **Evaluate Each Option**:
- **Option 1**: Starts with Lysine (Incorrect)
- **Option 2**: Starts with Methionine (Correct)
- **Option 3**: Starts with Valine (Incorrect)
- **Option 4**: Starts with Glycine (Incorrect)

5. **Conclusion**:
- The only option that starts with Methionine and follows the correct order for protein synthesis is **Option 2: Methionine, Lysine, Glycine, Valine, Histidine**.

### Final Answer:
The correct polypeptide sequence is **Methionine, Lysine, Glycine, Valine, Histidine**.

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