The DNA fragments separated on an agarose gel can be visualised after staining with:

Options

A. Ehthidium bromide
B. Bromophenol blue
C. Acetocarmine
D. Aniline blue

Answer

To solve the question regarding the visualization of DNA fragments separated on an agarose gel, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Process**: Agarose gel electrophoresis is a technique used to separate DNA fragments based on their size and mass. After the separation, it is important to visualize the DNA fragments to analyze the results.

2. **Identify Staining Options**: The question provides four options for staining the DNA fragments:
- A) Ethidium bromide
- B) Bromophenol blue
- C) Aceto carmine
- D) Aniline blue

3. **Evaluate Each Stain**:
- **Ethidium Bromide**: This is a fluorescent dye that intercalates between the bases of DNA. When exposed to ultraviolet (UV) light, it fluoresces, allowing for the visualization of DNA bands on the gel.
- **Bromophenol Blue**: This is a tracking dye commonly used in gel electrophoresis but does not specifically stain DNA for visualization.
- **Aceto Carmine**: This is a stain used for visualizing chromosomes in cytological preparations, not typically used for DNA in gels.
- **Aniline Blue**: This is a dye used for staining collagen and does not effectively stain DNA in gels.

4. **Select the Correct Answer**: Based on the evaluation, ethidium bromide is the most suitable option for visualizing DNA fragments on an agarose gel after electrophoresis.

### Conclusion:
The correct answer to the question is **Option A: Ethidium Bromide**.

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