Which of the following is /are the function of codon AUG?

Options

A. It acts as an initiation codon
B. It acts as a termination codon
C. The AUG codes for valine
D. none of these

Answer

To solve the question regarding the functions of the codon AUG, we will analyze the information step by step.

### Step-by-Step Solution:

1. **Identify the Codon AUG**:
- The codon AUG is known as the start codon in the genetic code.

2. **Function of AUG**:
- The primary function of the AUG codon is to signal the start of protein synthesis. It is recognized by the ribosome as the point where translation begins.

3. **AUG and Methionine**:
- AUG codes for the amino acid Methionine. When the ribosome encounters the AUG codon during translation, it incorporates Methionine as the first amino acid in the newly forming polypeptide chain.

4. **Distinguishing from Other Codons**:
- It is important to note that AUG is not a termination codon. Termination codons (such as UAA, UAG, and UGA) signal the end of protein synthesis. Therefore, the statement that AUG acts as a termination codon is incorrect.

5. **Conclusion**:
- The correct function of the codon AUG is that it acts as an initiation codon and codes for Methionine. However, it does not code for valine or act as a termination codon.

### Final Answer:
- The function of codon AUG is that it acts as an initiation codon and codes for Methionine.

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