Which is correct -
(i) t-RNA has an anticodon loop tht has bases complementary to the code
(ii) t-RNA has an amino acid acceptor end
(iii) t-RNA are specific for each amino acid
(iv) For initiation, there is specific t-RNA that is referred to as initiator t-RNA
(v) For termination there is specific t-RNA that is referred to as terminator t-RNA

Options

A. I, ii
B. I, ii, iii
C. I, ii, iii, iv
D. I, ii, iii, iv, v

Answer

To determine which statements about tRNA are correct, let's analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement (i): t-RNA has an anticodon loop that has bases complementary to the codon.**
- The tRNA molecule contains an anticodon loop that pairs with the corresponding codon on the mRNA during translation. The bases in the anticodon are indeed complementary to the bases in the codon. For example, if the codon on mRNA is AUG, the anticodon on tRNA will be UAC.
- **Conclusion:** This statement is **correct**.

2. **Statement (ii): t-RNA has an amino acid acceptor end.**
- tRNA molecules have a specific region known as the amino acid acceptor end, where the corresponding amino acid is attached. This end is crucial for the tRNA's function in protein synthesis.
- **Conclusion:** This statement is **correct**.

3. **Statement (iii): t-RNA are specific for each amino acid.**
- Each tRNA molecule is specific to a particular amino acid. This specificity is determined by the structure of the tRNA and the corresponding anticodon that pairs with the mRNA codon. For example, tRNA with the anticodon UAC carries the amino acid methionine.
- **Conclusion:** This statement is **correct**.

4. **Statement (iv): For initiation, there is specific t-RNA that is referred to as initiator t-RNA.**
- During the initiation of translation, there is indeed a specific tRNA known as the initiator tRNA that recognizes the start codon (AUG) on the mRNA. This tRNA carries the first amino acid (methionine) for the growing polypeptide chain.
- **Conclusion:** This statement is **correct**.

5. **Statement (v): For termination, there is specific t-RNA that is referred to as terminator t-RNA.**
- This statement is incorrect. There are no tRNAs that correspond to the stop codons (UAA, UAG, UGA). Instead, release factors recognize these stop codons and terminate translation. Therefore, there is no "terminator tRNA."
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion:
The correct statements are (i), (ii), (iii), and (iv). The incorrect statement is (v).