Term " virion " is used for

Options

A. mycoplasma colony
B. single virus
C. group of viruses
D. cancerous cells

Answer

### Step-by-Step Solution:

1. **Understanding the Term "Virion":**
- The term "virion" refers to a complete virus particle. It is the fully assembled form of a virus that is capable of infecting a host cell.

2. **Components of a Virion:**
- A virion consists of two main components:
- **Capsid:** This is the outer protein shell that encases the viral genetic material. The capsid provides protection and helps in the attachment of the virus to host cells.
- **Nucleic Acid Core:** Inside the capsid, there is a core that contains the viral genetic material, which can be either RNA (ribonucleic acid) or DNA (deoxyribonucleic acid). This genetic material is essential for the virus to replicate and infect host cells.

3. **Functionality of Virion:**
- The nucleic acid core is responsible for the infectivity of the virus, meaning it carries the information necessary for the virus to reproduce and spread. The capsid, on the other hand, provides specificity, allowing the virus to recognize and bind to specific host cells.

4. **Conclusion:**
- In summary, a virion is defined as a single virus particle or the complete virus particle. It is not a group of viruses or any other biological entity.

5. **Identifying the Correct Answer:**
- Based on the options provided:
- Mycoplasma colony: Incorrect
- Single virus: Correct
- Group of viruses: Incorrect
- Cancerous cells: Incorrect
- Therefore, the correct answer is "single virus."