In bacteria the codon AUG stands for -

Options

A. Glycine
B. Methionine
C. N-formyl methionine
D. Alanine

Answer

To answer the question "In bacteria the codon AUG stands for -", we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Codons**:
- Codons are sequences of three nucleotides in mRNA that correspond to specific amino acids. The codon AUG is particularly important as it serves as a start codon in protein synthesis.

2. **Analyzing the Options**:
- **Option A: Glycine**:
- Glycine is encoded by the codons GGU, GGC, GGA, and GGG. Since AUG is not one of these codons, this option is incorrect.

- **Option B: Methionine**:
- Methionine is indeed encoded by the codon AUG in eukaryotic cells. However, in bacteria, the first amino acid that is formed is actually a modified form of methionine known as N-formylmethionine (fMet). Therefore, while methionine is related to AUG, it is not the correct answer for bacteria.

- **Option C: N-formylmethionine**:
- In bacterial cells, the AUG codon specifically codes for N-formylmethionine. This is the correct answer because it is the first amino acid incorporated during protein synthesis in prokaryotes.

- **Option D: Alanine**:
- Alanine is encoded by the codons GCU, GCC, GCA, and GCG. Since AUG does not correspond to alanine, this option is also incorrect.

3. **Conclusion**:
- The correct answer is **N-formylmethionine** (Option C). In bacteria, the codon AUG stands for N-formylmethionine.

### Final Answer:
**In bacteria, the codon AUG stands for N-formylmethionine.**