One of the following is true with respect to AUG

Options

A. It codes for methionine only
B. It is also an initation coden
C. It codes for methionine in both prokaryotes and eukaryotes
D. All of the above

Explanation

To solve the question regarding the significance of the codon AUG, we will follow these steps:

### Step-by-Step Solution:

1. **Understanding Codons**:
- Codons are sequences of three nucleotides that correspond to specific amino acids or signals in the genetic code.

2. **Identifying AUG**:
- AUG is one of the 64 possible triplet codons in the genetic code. It is known as the start codon.

3. **Function of AUG**:
- AUG serves two primary functions:
- It codes for the amino acid methionine.
- It acts as the initiation codon for protein synthesis.

4. **Occurrence of AUG**:
- AUG is universally recognized in both prokaryotes (bacteria) and eukaryotes (plants, animals, fungi) as the start codon for translation.

5. **Comparison with Other Codons**:
- While there are 64 codons, only 20 amino acids exist. Most amino acids are encoded by multiple codons, but methionine (AUG) and tryptophan (UGG) are unique in that they are specified by a single codon.

6. **Conclusion**:
- Given the above points, we can conclude that AUG codes for methionine, serves as an initiation codon, and is recognized in both prokaryotes and eukaryotes.

### Final Answer:
- Therefore, the correct answer to the question "One of the following is true with respect to AUG" is **"All of the above."**

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