The intact virus unit or infectious particle is called :

Options

A. Capsomere
B. Virions
C. Bacteriophage
D. Muton

Answer

To answer the question "The intact virus unit or infectious particle is called:", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes an intact virus unit or an infectious particle.

2. **Analyzing the Options**: The options provided are:
- Capsomere
- Variants
- Bacteriophage
- Mutants

3. **Evaluating Each Option**:
- **Capsomere**: This is a subunit of the capsid, which is the protein coat of a virus. It does not refer to the whole infectious particle, so this option is incorrect.
- **Variants**: Variants refer to different forms of a virus that can cause infection. They consist of a genome and a protein coat, making them infectious particles. This option is likely correct.
- **Bacteriophage**: This is a specific type of virus that infects bacteria. While it is an infectious particle, it does not represent the general term for all viruses, so this option is incorrect.
- **Mutants**: Mutants refer to variations in genetic material and are not whole infectious particles, making this option incorrect.

4. **Conclusion**: After evaluating all options, the correct answer is **Variants**, as they represent intact virus units that can cause infections.

### Final Answer:
The intact virus unit or infectious particle is called **Variants**.