In prokaryotes, first amino acid taking part in protein synthesis is

Options

A. met
B. `f^(met)`
C. val
D. none of these

Answer

To answer the question "In prokaryotes, the first amino acid taking part in protein synthesis is?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Protein Synthesis**:
- Protein synthesis begins with the transcription of DNA into RNA. The RNA then translates into a sequence of amino acids, forming a protein.

2. **Role of Codons**:
- The genetic code is read in sets of three nucleotides called codons. Each codon corresponds to a specific amino acid.

3. **Identifying the Start Codon**:
- The process of translation begins at a specific codon known as the start codon. In both prokaryotes and eukaryotes, the start codon is typically AUG.

4. **AUG Codon**:
- The AUG codon codes for the amino acid methionine. In eukaryotes, methionine is the first amino acid incorporated into the growing polypeptide chain.

5. **Prokaryotic Protein Synthesis**:
- In prokaryotes, although AUG is still the start codon, the first amino acid that is incorporated is not methionine but a modified form called formylmethionine (often abbreviated as FMET).

6. **Conclusion**:
- Therefore, the first amino acid in prokaryotic protein synthesis is formylmethionine (FMET).

### Final Answer:
The first amino acid taking part in protein synthesis in prokaryotes is **formylmethionine (FMET)**.

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