Which of the following is correct ?

Options

A. All fungi are filamentous.
B. Transfer of DNA cannot take place from one bacteria to another.
C. A virus cannot have both DNA and RNA .
D. Protists can reproduces only asexually.

Answer

To solve the question "Which of the following is correct?" we need to evaluate each of the provided statements one by one.

### Step-by-Step Solution:

1. **Statement A: All fungi are filamentous.**
- Fungi are primarily composed of filamentous structures called hyphae. However, this statement is incorrect because not all fungi are filamentous. For example, yeasts are unicellular fungi that do not form hyphae. Therefore, this statement is **false**.

2. **Statement B: Transfer of DNA cannot take place from one bacteria to another.**
- This statement is also incorrect. Bacteria can exchange genetic material through processes such as conjugation, transformation, and transduction. Therefore, this statement is **false**.

3. **Statement C: Virus cannot have both DNA and RNA.**
- This statement is correct. Viruses can either have DNA or RNA as their genetic material, but they cannot possess both simultaneously. Therefore, this statement is **true**.

4. **Statement D: Protists can reproduce only asexually.**
- This statement is incorrect. Protists can reproduce both asexually and sexually. Sexual reproduction in protists can occur through processes such as syngamy, where two gametes fuse to form a zygote. Therefore, this statement is **false**.

### Conclusion:
After evaluating all the statements, the only correct statement is **C: A virus cannot have both DNA and RNA**.