The mRNA codon which codes for the amino acid valine is

Options

A. GUC
B. UGG
C. CCA
D. TTG

Answer

To determine the mRNA codon that codes for the amino acid valine, 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. There are a total of 64 possible codons (4^3 combinations of nucleotides A, U, C, G).

2. **Identify the Amino Acid**: We need to find the codon that codes for the amino acid valine.

3. **List the Given Options**: The options provided are:
- A) GOC
- B) BUGG
- C) CCCA
- D) TTG

4. **Check Each Option Against Known Codons**:
- **A) GOC**: This does not correspond to a valid mRNA codon since 'O' is not a nucleotide.
- **B) BUGG**: This also does not correspond to a valid mRNA codon since 'B' is not a nucleotide.
- **C) CCCA**: This does not correspond to a valid mRNA codon since 'C' is repeated and does not match known codons.
- **D) TTG**: This is a valid codon and it codes for the amino acid leucine, not valine.

5. **Identify the Correct Codon for Valine**: The correct codons for valine are GUU, GUC, GUA, and GUG. However, none of the options provided match these codons.

6. **Conclusion**: Since none of the given options correctly represent the codon for valine, it appears there may be an error in the options provided. The correct answer should be one of the codons GUU, GUC, GUA, or GUG.

### Final Answer:
None of the provided options correctly code for valine.