Which of the following statement is correct for virus ?

Options

A. Viruses contain either DNA or RNA
B. Viruses possess their own cell membrane
C. Viruses are facultative parasites
D. Viruses are readily killed by antibiotics

Answer

To solve the question regarding which statement is correct for viruses, we can analyze each option provided:

1. **Viruses contain either DNA or RNA.**
- This statement is true. Viruses can have either DNA or RNA as their genetic material, but they do not have both. The genetic material is enclosed in a protein coat known as a capsid.

2. **Viruses possess their own cell membrane.**
- This statement is false. Viruses do not have a cell membrane. They are non-cellular entities and do not possess the structures typical of living cells.

3. **Viruses are facultative parasites.**
- This statement is also false. Viruses are obligate parasites, meaning they must infect a host cell to replicate and survive. They cannot reproduce independently.

4. **Viruses are readily killed by antibiotics.**
- This statement is false. Antibiotics are designed to target bacterial cells and do not affect viruses, as viruses lack the cellular structures that antibiotics target.

Based on the analysis, the correct statement is:
- **Viruses contain either DNA or RNA.**

### Step-by-Step Solution:
1. **Identify the statements provided.**
- Read through the options carefully to understand what each one claims about viruses.

2. **Evaluate the first statement: "Viruses contain either DNA or RNA."**
- Confirm that this is true, as viruses can have either type of genetic material, but not both.

3. **Evaluate the second statement: "Viruses possess their own cell membrane."**
- Recognize that this is false; viruses do not have a cell membrane.

4. **Evaluate the third statement: "Viruses are facultative parasites."**
- Understand that this is incorrect; viruses are obligate parasites.

5. **Evaluate the fourth statement: "Viruses are readily killed by antibiotics."**
- Acknowledge that this is also false; antibiotics do not work on viruses.

6. **Conclude which statement is correct.**
- The only correct statement is that viruses contain either DNA or RNA.