In gel electrophoresis, DNA fragments move through the gel toward the:
Answer and explanation
Correct answer: D. Positive electrode, with the smaller fragments travelling further in the same time
- Step 1: The phosphate groups make DNA negatively charged, so it moves toward the positive electrode.
- Step 2: The gel is a mesh, so small fragments pass through more easily and travel further.
Answer
positive electrode, small fragments travel further.
Why not the others: Moving to the negative electrode contradicts DNA's charge; larger fragments are slowed by the mesh.
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