Infectious proteins are presents in

Options

A. Satellite viruses
B. Gemini viruses
C. Prions
D. Viroids

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the presence of infectious proteins. We need to identify which option corresponds to infectious proteins.

2. **Analyzing the Options**:
- **Option 1: Satellite Virus**: These are sub-viral agents made of nucleic acids (DNA or RNA) and require a helper virus for infection and replication. They are not proteins, so this option is incorrect.
- **Option 2: Deminivirus**: These are plant viruses that cause diseases in plants. They are not proteins but rather viral entities, making this option incorrect as well.
- **Option 3: Viroids**: These are the smallest pathogens that consist solely of circular single-stranded RNA. They do not contain proteins and are not classified as infectious proteins, so this option is also incorrect.
- **Option 4: Prions**: Prions are misfolded proteins that can induce normal proteins to also misfold. This characteristic classifies them as infectious proteins.

3. **Identifying the Correct Answer**: After analyzing all the options, it is clear that prions are the only infectious proteins among the choices provided.

4. **Conclusion**: The correct answer to the question "Infectious proteins are present in" is **Prions**.