Which is recognition site of tRNA?

Options

A. Anticodon
B. Loop I
C. Loop IV
D. 5'-OH end

Answer

To answer the question "Which is the recognition site of tRNA?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding tRNA Structure**:
- tRNA (transfer RNA) has a specific three-dimensional structure that is crucial for its function in protein synthesis. It consists of several important regions, including the acceptor arm, anticodon loop, and various loops.

2. **Identifying the Recognition Site**:
- The recognition site of tRNA is where it interacts with mRNA (messenger RNA) during translation. This interaction is essential for the correct incorporation of amino acids into the growing polypeptide chain.

3. **Analyzing the Options**:
- The options given are:
- A) Anticodon
- B) Loop 1
- C) Loop 4
- D) 5th OH end
- Among these, the anticodon is a specific sequence of three nucleotides that pairs with the complementary codon on the mRNA.

4. **Conclusion**:
- The anticodon loop is the recognition site of tRNA because it directly binds to the codons on the mRNA, ensuring that the correct amino acid is added to the growing protein chain. Therefore, the correct answer is **A) Anticodon**.

### Final Answer:
The recognition site of tRNA is the **anticodon**.

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