What is the purpose of untranslated regions UTRs present on mRNA?

Options

A. To stop the process of translation
B. To start the process of translation
C. For efficient translation
D. For DNA recognition

Answer

### Step-by-Step Solution:

1. **Understanding UTRs**: Untranslated regions (UTRs) are segments of mRNA that are not translated into proteins. They are found at both the 5' and 3' ends of the mRNA molecule.

2. **Identifying the Role of UTRs**: The primary purpose of UTRs is to play a regulatory role in the translation process. They help in the regulation of translation efficiency and stability of the mRNA.

3. **Analyzing Options**:
- **Option A**: "To stop the process of translation" - This is incorrect. The stopping of translation is done by stop codons (UAA, UAG, UGA).
- **Option B**: "To start the process of translation" - This is also incorrect. The initiation of translation is facilitated by start codons (AUG).
- **Option C**: "For efficient translation" - This is correct. UTRs are essential for the regulation of translation and help in ensuring that translation occurs efficiently.

4. **Conclusion**: The correct answer is that the purpose of untranslated regions (UTRs) present on mRNA is for efficient translation regulation.