Formylated methioine acts as translation initiation in

Options

A. Eubacteria
B. Eukaryotes
C. Viruses
D. Archabacteria

Answer

**Step-by-Step Solution:**

1. **Understanding Translation Initiation**: Translation is the process of protein synthesis in cells, which involves three main stages: initiation, elongation, and termination. The initiation stage is crucial as it sets the stage for the entire protein synthesis process.

2. **Identifying the Role of Methionine**: In all organisms, the synthesis of proteins begins with the amino acid methionine. This amino acid is essential for the initiation of translation.

3. **Formylated Methionine in Eubacteria**: In eubacteria (a group of prokaryotic organisms), the initiating amino acid is a modified form of methionine known as formylmethionine (fMet). This modification is specific to eubacteria and is important for the initiation of protein synthesis in these organisms.

4. **Comparison with Other Organisms**:
- In eukaryotes (organisms with complex cells), the initiating amino acid is regular methionine (not formylated).
- In archaebacteria (another group of prokaryotes), the initiation also involves methionine, but it is not formylated.
- Viruses can vary widely in their mechanisms of translation initiation, but they do not typically use formylated methionine.

5. **Conclusion**: Based on the information, formylated methionine acts as the translation initiation amino acid specifically in eubacteria.

**Final Answer**: Formylated methionine acts as translation initiation in **eubacteria**.

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