Which one of the following pairs is correctly matched with regard to the codon and the amino acid coded by it?

Options

A. CCC -alanine
B. AAA-lysine
C. UUA-valine
D. AUG-cysteine

Answer

To solve the question regarding which pair is correctly matched with regard to the codon and the amino acid coded by it, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Codons**: Codons are sequences of three nucleotides that correspond to specific amino acids or stop signals during protein synthesis. There are 64 possible codons, of which 61 code for amino acids and 3 are stop codons.

2. **Evaluating Each Option**:
- **Option 1: CCC - Alanine**
- CCC actually codes for **Proline**, not Alanine.
- **Conclusion**: This pair is incorrect.

- **Option 2: AAA - Lysine**
- AAA codes for **Lysine**.
- **Conclusion**: This pair is correct.

- **Option 3: UUA - Valine**
- UUA codes for **Leucine**, not Valine.
- **Conclusion**: This pair is incorrect.

- **Option 4: AUG - 16**
- AUG is known as the start codon and codes for **Methionine**. The mention of "16" is irrelevant and incorrect.
- **Conclusion**: This pair is incorrect.

3. **Final Conclusion**: The only correctly matched pair is **AAA - Lysine**.

### Answer:
The correct pair is **AAA - Lysine**.

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