Viruses have proteins and

Options

A. ds DNA or ssRNA
B. ssRNA or ds RNA
C. DNA and RNA
D. ds or ss RNA/DNA

Answer

### Step-by-Step Solution:

1. **Understanding the Composition of Viruses**:
- Viruses are unique entities that consist of two main components: proteins and nucleic acids.

2. **Identifying the Protein Component**:
- The protein part of a virus is known as the **capsid**. The capsid serves as a protective shell for the viral genetic material.

3. **Understanding Nucleic Acids in Viruses**:
- The nucleic acid in viruses can either be **DNA (Deoxyribonucleic Acid)** or **RNA (Ribonucleic Acid)**.

4. **Types of Nucleic Acids**:
- The nucleic acids can be categorized as:
- **Single-stranded RNA (ssRNA)**
- **Double-stranded RNA (dsRNA)**
- **Single-stranded DNA (ssDNA)**
- **Double-stranded DNA (dsDNA)**

5. **Analyzing the Options**:
- The question provides different combinations of nucleic acids:
- Option 1: Double-stranded DNA and single-stranded RNA
- Option 2: Single-stranded RNA and double-stranded RNA
- Option 3: DNA (unspecified if single or double-stranded)
- Option 4: Double-stranded RNA and single-stranded RNA and DNA

6. **Selecting the Correct Answer**:
- The correct answer is **Option 4**, as it encompasses the possibility of having both double-stranded RNA and single-stranded RNA along with DNA.