The function of non-sense codons is-

Options

A. To release polypeptide chain from t-RNA
B. To from an unsprcified amino acid
C. To terminate the masseage of a gene controlled
D. To convert a sense DNA into non sense DNA

Answer

### Step-by-Step Solution:

1. **Understanding Codons**:
- Codons are sequences of three nucleotides found in mRNA that correspond to specific amino acids. Each codon is essential for the translation process, where the genetic code is converted into proteins.

2. **Role of tRNA**:
- Transfer RNA (tRNA) reads the codons on the mRNA and brings the corresponding amino acids to the growing polypeptide chain during translation.

3. **Initiation of Translation**:
- The translation process begins with a start codon, which is typically AUG (adenine-uracil-guanine) that codes for the amino acid methionine (MET).

4. **Termination of Translation**:
- To ensure that the translation process does not continue indefinitely, there are stop codons. These are specific codons that signal the end of protein synthesis. The three stop codons are UAA, UAG, and UGA.

5. **Function of Nonsense Codons**:
- Nonsense codons (stop codons) do not code for any amino acids. When a ribosome encounters one of these codons during translation, it triggers the release of the newly synthesized polypeptide chain from the tRNA, effectively terminating the translation process.

6. **Conclusion**:
- Therefore, the function of nonsense codons is to release the polypeptide chain from tRNA, signaling the end of protein synthesis.

### Final Answer:
The function of nonsense codons is to release the polypeptide chain from tRNA, thereby terminating the translation process.

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