Retrovirus have genetic material :-

Options

A. DNA only
B. RNA only
C. DNA or RNA only
D. None

Answer

**Step-by-Step Solution:**

1. **Understanding Retroviruses:**
- Retroviruses are a type of virus that have a unique mechanism of replication. They are known for their ability to reverse the usual flow of genetic information.

2. **Universal Dogma of Molecular Biology:**
- The universal dogma states that genetic information flows from DNA to RNA to protein. This means that DNA is transcribed into RNA, which is then translated into proteins.

3. **Retrovirus Genetic Material:**
- Unlike typical viruses, retroviruses contain RNA as their genetic material. This is a key characteristic that distinguishes them from other viruses.

4. **Reverse Transcription:**
- Retroviruses use an enzyme called reverse transcriptase to convert their RNA into DNA. This process is called reverse transcription, which is the reverse of the normal transcription process.

5. **Integration into Host DNA:**
- Once the RNA is converted into DNA, this newly formed DNA (often referred to as complementary DNA or cDNA) integrates into the host cell's DNA. This allows the virus to replicate using the host's cellular machinery.

6. **Transcription and Translation:**
- After integration, the viral DNA can be transcribed back into RNA, which can then be translated into viral proteins. These proteins are essential for the formation of new viral particles.

7. **Conclusion:**
- Therefore, the genetic material of retroviruses is RNA.

**Final Answer:**
Retroviruses have genetic material that is RNA.

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