Non - sense codons participate in:

Options

A. Releasing t - RNA from polynucleotide chain
B. Formation of unspecified amino acids
C. Terminating message of gene - controlled protein synthesis
D. Conversion of sense DNA into non - sense DNA

Answer

To solve the question regarding the role of non-sense codons, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Non-Sense Codons**:
- Non-sense codons, also known as stop codons, are specific sequences in mRNA that signal the termination of protein synthesis. They do not code for any amino acids.

2. **Identifying Functions of Non-Sense Codons**:
- The primary function of non-sense codons is to terminate the elongation of the polypeptide chain during translation. This is crucial for ensuring that proteins are synthesized correctly and do not continue indefinitely.

3. **Analyzing the Options**:
- **Option A**: Releasing tRNA from the polynucleotide chain - This is mainly associated with the E site of the ribosome, but it is not the direct role of non-sense codons.
- **Option B**: Formation of unspecified amino acid - This is related to mutations and not the function of non-sense codons.
- **Option C**: Terminating message of gene control protein synthesis - This is the correct function of non-sense codons, as they signal the end of translation.
- **Option D**: Conversion of sense DNA into non-sense DNA - This is also a result of mutations and not a function of non-sense codons.

4. **Conclusion**:
- The correct answer is **Option C**: Non-sense codons participate in terminating the message of gene control protein synthesis.