Sometimes the starting codon is GUG in place of AUG, GUG normally stands for :-

Options

A. Valine
B. Glycine
C. Methionine
D. Tyrosine

Answer

To solve the question regarding what the codon GUG normally stands for, 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. The question mentions two codons: GUG and AUG.

2. **Identify the Standard Start Codon**: AUG is the standard start codon in mRNA, which codes for the amino acid Methionine.

3. **Identify the Codon in Question**: The codon GUG is also mentioned. We need to determine which amino acid GUG codes for.

4. **Refer to the Genetic Code Table**: The genetic code table lists the amino acids corresponding to each codon. By looking up GUG in the table, we find that it codes for the amino acid Valine.

5. **Conclusion**: Therefore, in normal conditions, GUG stands for Valine.

### Final Answer:
GUG normally stands for **Valine**.

---