The UTR [untranslated regions] in an mRNA:
1. | Are present only at 5’ end and are not required for efficient translation |
2. | Are present only at 3’ end and are not required for efficient translation |
3. | Are present at both 5’ and 3’ends and are not required for efficient translation |
4. | Are present at both 5’ and 3’ ends and are required for an efficient translation process |