In gel electrophoresis, which way do DNA fragments move, and which travel farthest?
Answer and explanation
Correct answer: D. Towards the positive electrode, with the smaller fragments travelling farthest
- Step 1: DNA is negatively charged because of its phosphate groups. Step 2. Smaller fragments pass through the gel more easily. Answer: positive electrode, small fragments farthest. Why not the others: these mix up the charge or the size effect.
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