Name the material used as matrix in gel-electrophoresis and mention its role.

Explanation

**Step-by-Step Solution:**

1. **Identify the Technique**: Gel electrophoresis is a technique used for the separation of DNA fragments. It is commonly used in molecular biology for analyzing DNA.

2. **Understand the Matrix**: The material used as a matrix in gel electrophoresis is **agarose**.

3. **Source of Agarose**: Agarose is derived from seaweed, specifically from certain types of red algae.

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