Which one of the following pairs of codons is correctly matched with their function or the signal for the particular amino acid ?

Options

A. GUU , GCU - Alanine
B. UAG , UGA - Stop
C. AUG , ACG - Start/ methionine
D. UUA, UCA - Leucine

Explanation

To solve the question of which pair of codons is correctly matched with their function or the signal for a particular amino acid, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Codons**: Codons are sequences of three nucleotides in mRNA that correspond to specific amino acids or signals during protein synthesis.

2. **Identify the Options**: The options given are:
- GUU, GCU: Codes for Alanine
- UAG, UGA: Stop codons
- AUG, ACG: Start codon (Methionine)
- UUA, UCA: Codes for Leucine

3. **Analyze Each Pair**:
- **GUU, GCU**: GUU codes for Valine, and GCU codes for Alanine. This pair is incorrectly matched.
- **UAG, UGA**: Both UAG and UGA are known stop codons. This pair is correctly matched.
- **AUG, ACG**: AUG is the start codon and codes for Methionine, while ACG codes for Threonine. This pair is incorrectly matched.
- **UUA, UCA**: UUA codes for Leucine, and UCA codes for Serine. This pair is incorrectly matched.

4. **Conclusion**: The only pair that is correctly matched with their function is **UAG, UGA**, as both are stop codons.

### Final Answer:
The correctly matched pair of codons with their function is **UAG, UGA** (Stop codons).

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