A virus with as DNA is

Options

A. `phi xx 174`
B. Coliphage fd
C. Coliphage MS2
D. All the above

Answer

To solve the question "A virus with a genome as DNA is", we need to analyze the options provided: 5174 virus, polyphage fd, polyphage ms2, and all of the above.

### Step-by-Step Solution:

1. **Understanding Virus Classification**:
- Viruses can be classified based on their genetic material. They can either have DNA or RNA as their genome.
- DNA viruses are referred to as deoxyviruses, while RNA viruses are called riboviruses.

2. **Analyzing the Options**:
- **5174 Virus**: This virus is known to have a DNA genome and specifically infects E. coli.
- **Polyphage FD**: This is a type of coliphage that has an RNA genome, making it a ribovirus.
- **Polyphage MS2**: Similar to polyphage FD, this is also an RNA virus and does not have a DNA genome.

3. **Identifying the Correct Answer**:
- Since the question specifically asks for a virus with a DNA genome, we need to identify which of the options fits this criterion.
- Among the options, only the 5174 virus is classified as a DNA virus.

4. **Conclusion**:
- Therefore, the correct answer to the question is the **5174 virus**.

### Final Answer:
The virus with a genome as DNA is the **5174 virus**.

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