The amino acid attaches to the tRNA at its

Options

A. 5 end where OH is present
B. 3' end where OH is present
C. recognition site
D. loop l

Answer

To answer the question "The amino acid attaches to the tRNA at its ___", we need to understand the structure of tRNA and the process of amino acid attachment. Here’s a step-by-step solution:

### Step 1: Understand tRNA Structure
Transfer RNA (tRNA) is a type of RNA molecule that plays a crucial role in protein synthesis. It has a specific structure that includes an acceptor stem, an anticodon, and a variable region.

**Hint:** Recall the basic structure of tRNA and its functional regions.

### Step 2: Identify the Attachment Site
The amino acid attaches to the tRNA at the 3' end of the molecule. This is where the amino acid is covalently linked to the tRNA.

**Hint:** Focus on the ends of the tRNA molecule and remember which end is the 3' end.

### Step 3: Amino Acid Activation
The attachment of the amino acid to tRNA is facilitated by an enzyme called aminoacyl-tRNA synthetase. This enzyme catalyzes the reaction that links the amino acid to the tRNA.

**Hint:** Think about the role of enzymes in biochemical reactions, particularly in the context of protein synthesis.

### Step 4: Role in Protein Synthesis
Once the amino acid is attached to the tRNA, the tRNA carries the amino acid to the ribosome during the process of translation, where proteins are synthesized.

**Hint:** Consider how tRNA functions in the larger context of translation and protein synthesis.

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