Gel Electrophoresis Online Simulation Flashcards | Quizlet What is electrophoresis used for? Pushing DNA strands through the gel filter (Moving DNA) What is the material of the gel similar to? A sponge made of Jello Describe how the DNA fragments migrate through the gel matrix. DNA strands of the same length will move at the same speed and group up together, they move through holes in the sponge.