The amino acid attaches to the tRNA at its

Options

A. 5' - end
B. 3' - end
C. Anti codon site
D. DHU loop

Answer

To solve the question "The amino acid attaches to the tRNA at its," we need to analyze the structure of tRNA and understand where the amino acid binds.

### Step-by-Step Solution:

1. **Understanding tRNA Structure**:
- Transfer RNA (tRNA) is a type of RNA molecule that plays a crucial role in protein synthesis. It has a specific three-dimensional structure that includes an anticodon loop and an amino acid acceptor site.

2. **Identifying the Anticodon Loop**:
- The anticodon loop is a part of the tRNA that contains a sequence of three nucleotides that are complementary to the mRNA codon. This allows the tRNA to recognize and bind to the corresponding codon on the mRNA during translation.

3. **Examining Other Parts of tRNA**:
- The tRNA also has a DHU loop, which is involved in the recognition by the aminoacyl-tRNA synthetase but does not bind the amino acid.
- The 5' end of the tRNA does not have the amino acid attachment site.

4. **Identifying the Amino Acid Attachment Site**:
- The amino acid attaches to the tRNA at the 3' end of the molecule. This is the site where the amino acid is covalently bonded to the tRNA through an ester bond. The attachment occurs specifically at the 3' end opposite the anticodon.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the amino acid attaches to the tRNA at its **3' end**.

### Final Answer:
The amino acid attaches to the tRNA at its **3' end**.