Which of the following is used to deliver , a desirable gene into an animal cell ?

Options

A. Disarmed retrovirus
B. Disarmed Agrobacterium
C. Disarmed E.coli
D. Both (A) and (C)

Answer

To solve the question of which method is used to deliver a desirable gene into an animal cell, we will analyze the options provided and determine the correct answer step by step.

### Step 1: Understand the Requirement
The question asks for a method to deliver a desirable gene into an animal cell. This typically involves the use of vectors, which are agents that can carry genetic material into cells.

### Step 2: Analyze the Options
1. **Disarmed Retroviruses**:
- Retroviruses are viruses that have RNA as their genetic material. They can integrate their genetic material into the host's DNA after converting their RNA into DNA using an enzyme called reverse transcriptase.
- Disarmed retroviruses are modified to remove their ability to cause cancer, making them safer for gene delivery into animal cells.
- **Conclusion**: This option is viable for gene delivery into animal cells.

2. **Disarmed Agrobacterium**:
- Agrobacterium tumefaciens is a bacterium that primarily infects plants and is used to transfer genes into plant cells, not animal cells.
- **Conclusion**: This option is incorrect for animal cells.

3. **Disarmed E. coli**:
- E. coli is a bacterium commonly used in molecular biology, but it does not have the capability to deliver genes into animal cells effectively.
- **Conclusion**: This option is also incorrect for animal cells.

### Step 3: Identify the Correct Answer
Based on the analysis:
- The only suitable option for delivering a desirable gene into an animal cell is **Disarmed Retroviruses**.

### Final Answer
**Disarmed Retroviruses** are used to deliver a desirable gene into an animal cell.

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