The genetic material in the TMV is

Options

A. double - stranded DNA.
B. single - stranded DNA.
C. double - stranded RNA.
D. single - stranded RNA.

Answer

To solve the question regarding the genetic material in the Tobacco Mosaic Virus (TMV), we can follow these steps:

### Step-by-Step Solution:

1. **Identify TMV**: Understand what TMV stands for. TMV is the Tobacco Mosaic Virus, which primarily affects tobacco plants and causes the tobacco mosaic disease.

**Hint**: Remember that TMV is specifically associated with tobacco plants and is known for causing a distinctive disease.

2. **Determine the Type of Virus**: Recognize that TMV is classified as a virus. It is important to know that viruses can have different types of genetic material, such as DNA or RNA.

**Hint**: Recall that viruses can be categorized based on their genetic material, which can be either DNA or RNA.

3. **Identify the Genetic Material**: TMV is known to have single-stranded RNA as its genetic material. This is a key characteristic that distinguishes it from other types of viruses.

**Hint**: Focus on the fact that TMV is a single-stranded RNA virus, which is crucial for understanding its structure and function.

4. **Classify the RNA**: TMV's RNA is classified as positive-sense RNA. This means that the RNA can be directly translated into proteins by the host cell's ribosomes.

**Hint**: Positive-sense RNA can be thought of as similar to mRNA, which is directly used for protein synthesis.

5. **Conclusion**: Based on the above points, we conclude that the genetic material in TMV is single-stranded RNA.

**Hint**: Summarize the information to reinforce that TMV's genetic material is specifically single-stranded RNA.

### Final Answer:
The genetic material in the Tobacco Mosaic Virus (TMV) is single-stranded RNA.