Most of the viruses are/have

Options

A. Enveloped nucleo-protein structure
B. Non-enveloped nucleo-protein structure
C. Infectious protein particles
D. Double stranded DNA as well as dsRNA

Answer

**Step-by-Step Solution:**

1. **Understanding Viruses**:
- Viruses are non-cellular organisms that are much smaller than bacteria. They consist of genetic material (either DNA or RNA) surrounded by a protein coat called a capsid. Some viruses also have an outer lipid envelope.

2. **Analyzing the Options**:
- **Option 1: Enveloped nucleoprotein structure**:
- This is not true for most viruses, as only some viruses have an envelope.
- **Option 2: Non-enveloped nucleoprotein structure**:
- This statement is true. Many viruses are indeed non-enveloped, consisting of nucleic acid (RNA or DNA) surrounded by a protein coat.
- **Option 3: Infectious protein particles**:
- This is false. While prions are infectious proteins, viruses are not just proteins; they contain nucleic acids which are essential for their infectivity.
- **Option 4: Double-stranded DNA as well as double-stranded RNA**:
- This is also false. Most viruses contain single-stranded RNA or single-stranded DNA, not double-stranded forms.

3. **Conclusion**:
- After analyzing all the options, the correct answer is **Option 2: Non-enveloped nucleoprotein structure**.