Assertion :-An mRNA also have some additional sequences that are not translated & are referred as UTR.
Reason :- The UTSs are present at both 5' end & at 3' end and they have no specific function.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are trur but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is Flase.
D. If both Assertion & Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "An mRNA also has some additional sequences that are not translated and are referred to as UTR."
- UTR stands for Untranslated Regions, which are indeed parts of the mRNA that do not code for proteins.

2. **Evaluating the Assertion**:
- This statement is **correct**. UTRs are present in mRNA and do not get translated into proteins.

3. **Understanding the Reason**:
- The reason states that "The UTRs are present at both the 5' end and at the 3' end and they have no specific function."
- UTRs are indeed located at both ends of the mRNA (5' UTR and 3' UTR).

4. **Evaluating the Reason**:
- While it is true that UTRs are present at both ends, the claim that they "have no specific function" is **incorrect**. UTRs play crucial roles in the regulation of translation, stability of the mRNA, and the initiation of translation.

5. **Conclusion**:
- The assertion is true, but the reason is false. Therefore, the correct answer is that the assertion is true and the reason is false.

### Final Answer:
- Assertion: True
- Reason: False