Now a days which is the most commonly used matrix of electrophoresis ?

Answer

### Step-by-Step Solution:

1. **Understanding Gel Electrophoresis**:
- Gel electrophoresis is a technique used to separate DNA fragments based on their size. It involves the movement of charged molecules through a gel matrix when an electric current is applied.

2. **Identifying the Matrix Used**:
- The matrix used in gel electrophoresis is crucial for the separation process. It provides a medium through which the DNA fragments can migrate.

3. **Commonly Used Matrix**:
- The most commonly used matrix for gel electrophoresis is **agarose gel**.

4. **Source of Agarose Gel**:
- Agarose is a natural polymer that is derived from seaweeds, making it a biocompatible choice for separating nucleic acids.

5. **Functionality of Agarose Gel**:
- Agarose gel allows for the separation of DNA fragments by size, with smaller fragments moving faster through the gel compared to larger ones.

6. **Conclusion**:
- Therefore, the answer to the question is that the most commonly used matrix in gel electrophoresis is **agarose gel**.