The amino acid attaches to the tRNA at its

Options

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

Answer

**Step-by-Step Solution:**

1. **Understand the Structure of tRNA**:
- tRNA (transfer RNA) has a specific structure that includes a 3' end, a 5' end, an anticodon loop, and a variable loop.
- The anticodon loop is responsible for pairing with the corresponding codon on mRNA during protein synthesis.

2. **Identify the Key Sites on tRNA**:
- The 3' end of the tRNA is crucial for the attachment of an amino acid.
- The 5' end does not participate in amino acid attachment; instead, it is involved in other functions such as binding to the ribosome.
- The anticodon site is where the tRNA pairs with the mRNA codon, not where the amino acid attaches.
- The DHU loop (dihydroxyuridine loop) is involved in the stability and recognition of tRNA but does not serve as the attachment site for amino acids.

3. **Determine the Correct Answer**:
- Among the options given (A-5'N, B-3'N, C-antigodon site, D-DHU lobe), the correct answer is **B-3'N**. This is where the amino acid attaches to the tRNA.

4. **Conclusion**:
- The amino acid attaches to the tRNA at its 3' end, which is the site designated for amino acid attachment during the process of translation.

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