Select the incorrect matched pair.

Options

A. Initiation codons-AUG,GUG
B. Stop codons-U A A , UAG, UGA
C. Methionine- AUG
D. Anticodons - mRNA

Answer

To solve the question of selecting the incorrect matched pair, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding Initiation Codons**:
- The first option mentions that the initiation codon is AUG and GUG.
- AUG is indeed the primary start codon that codes for methionine in eukaryotes and formylmethionine in prokaryotes.
- GUG can also serve as a start codon in some cases, although it is less common.
- **Conclusion**: This pair is correctly matched.

2. **Understanding Stop Codons**:
- The second option lists UAA, UAG, and UGU as stop codons.
- UAA and UAG are well-known stop codons that signal the termination of translation.
- UGU, however, codes for the amino acid cysteine and is not a stop codon.
- **Conclusion**: This pair is incorrectly matched.

3. **Understanding Methionine Codon**:
- The third option states that AUG codes for methionine in eukaryotes and formylmethionine in prokaryotes.
- This is accurate as AUG is the start codon and codes for methionine.
- **Conclusion**: This pair is correctly matched.

4. **Understanding Anticodons**:
- The fourth option discusses anticodons.
- An anticodon is a trinucleotide sequence that is complementary to a codon in mRNA and is found at the end of the transfer RNA (tRNA), not mRNA.
- **Conclusion**: This pair is incorrectly matched.

### Final Answer:
The incorrect matched pair is the second option (UAA, UAG, UGU as stop codons) and the fourth option regarding the location of anticodons.