What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis?
- AThe larger the fragment size, the farther it moves
- BThe smaller the fragment size, the farther it moves
- CPositively charged fragments move to farther end
- DNegatively charged fragments do not move
Solution & Step-by-step Explanation
Gel electrophoresis separates DNA based on size through a sieving effect. DNA is negatively charged and moves toward the positive anode. Smaller fragments encounter less resistance from the gel matrix and thus move farther and faster than larger ones.