Select the incorrectly matched pair

Options

A. Initiation Codons - AUG, GUG
B. Stop codons - UAA, UAG, UGA
C. Methionine - AUG
D. Anticodons - tRNA

Answer

To solve the question of selecting the incorrectly matched pair, we will analyze each of the given pairs step by step.

### Step-by-Step Solution:

1. **Understand the Terms**:
- We need to identify what each term means in the context of molecular biology, particularly in relation to codons and their functions.

2. **Identify the Initiation Codons**:
- The initiation codon is the codon that signals the start of translation. The most common initiation codon is AUG, which codes for Methionine.
- GUG can also serve as a start codon in some organisms, but it primarily codes for the amino acid Valine.

3. **Review the Stop Codons**:
- Stop codons are UAA, UAG, and UGA. These codons signal the termination of protein synthesis. This part of the matching is correct.

4. **Check the Methionine Codon**:
- AUG is indeed the codon that codes for Methionine. This is a correct match.

5. **Examine the Anticodon**:
- The anticodon is a sequence of three nucleotides on tRNA that is complementary to the codon on mRNA. This is also a correct match.

6. **Identify the Incorrect Pair**:
- The pair "Initiation codon AUG, GUG" is incorrectly matched because while AUG is a correct initiation codon, GUG is not primarily recognized as an initiation codon in most contexts. Therefore, this is the incorrectly matched pair.

### Final Answer:
The incorrectly matched pair is **Initiation codon AUG, GUG**.

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