The following codon do not code for any amino acid are

Options

A. UAA
B. UGA
C. UAG
D. All

Answer

To solve the question regarding which codons do not code for any amino acids, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Codons**: Codons are sequences of three nucleotides in mRNA that correspond to specific amino acids or signal the termination of protein synthesis.

2. **Identifying Stop Codons**: The question mentions specific codons: UAA, UGA, and UAG. We need to determine if these codons code for amino acids or not.

3. **Classification of Codons**:
- **UAA**: This codon is known as a stop codon (termination codon) and does not code for any amino acid.
- **UGA**: This codon is also a stop codon but can code for the rare amino acid selenocysteine in specific contexts.
- **UAG**: This codon is another stop codon but can code for the rare amino acid pyrrolysine in certain organisms.

4. **Conclusion**: Among the codons listed, UAA is the only codon that does not code for any amino acid under standard conditions. UGA and UAG can code for rare amino acids in specific situations.

5. **Final Answer**: Therefore, the codon that does not code for any amino acid is **UAA**.