What is incorrect for UTR?

Options

A. Present in between the translational unit in mRNA
B. Not recognised by any tRNA
C. Required for efficient translation process
D. Provide stability to mRNA

Answer

### Step-by-Step Solution

1. **Understanding UTR**: UTR stands for Untranslated Region. It is a segment of mRNA that is not translated into protein. There are two types of UTRs: the 5' UTR located at the beginning of the mRNA and the 3' UTR located at the end.

2. **Location of UTR**: UTRs are found at the ends of the mRNA molecule. Specifically, the 5' UTR is located before the start codon, and the 3' UTR is located after the stop codon. Therefore, UTRs are not found in the middle of the coding sequence (translation unit) of the mRNA.

3. **Function of UTR**: UTRs play several important roles:
- They are not recognized by tRNA, which means they do not code for amino acids.
- They are involved in the regulation of translation and stability of the mRNA molecule.
- They help in the efficient translation process by providing stability and facilitating the binding of ribosomes.

4. **Analyzing the Options**:
- **Option 1**: "Present in the between translated unit of mRNA" - This statement is incorrect because UTRs are located at the ends of the mRNA, not in the middle.
- **Option 2**: "Not recognized by any tRNA" - This statement is correct as UTRs do not code for proteins and are not recognized by tRNA.
- **Option 3**: "Required for the efficient translation process" - This statement is correct as UTRs contribute to the stability and regulation of translation.
- **Option 4**: "Provide stability to mRNA" - This statement is also correct as UTRs help in maintaining the integrity and stability of the mRNA.

5. **Conclusion**: The only incorrect statement regarding UTRs is the first option, as UTRs are not present in the middle of the translation unit.

### Final Answer
The incorrect statement regarding UTR is: "Present in the between translated unit of mRNA."

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