Which of the following is terminated codon?

Options

A. AUG
B. AUU
C. UAG
D. UGG

Answer

To determine which of the given codons is a termination codon (stop codon), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Codons**: Codons are sequences of three nucleotides that correspond to specific amino acids or signal the termination of protein synthesis. There are 64 possible codons, of which 61 code for amino acids and 3 are stop codons.

2. **Identify the Given Codons**: The codons provided in the question are:
- AUG
- AUU
- UAG
- UGG

3. **Determine the Function of Each Codon**:
- **AUG**: This codon is known as the start codon. It codes for the amino acid Methionine and also serves as the initiation point for translation. Thus, it is not a stop codon.
- **AUU**: This codon codes for the amino acid Isoleucine. Therefore, it is also not a stop codon.
- **UAG**: This codon is one of the three stop codons. It does not code for any amino acid and signals the termination of protein synthesis.
- **UGG**: This codon codes for the amino acid Tryptophan. Hence, it is not a stop codon.

4. **Conclusion**: Among the given options, the only codon that serves as a termination codon is **UAG**.

### Final Answer:
The termination codon from the given options is **UAG**.

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