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In gel electrophoresis, DNA fragments move toward the:
ANegative electrode (cathode), as DNA carries positive charge
BPositive electrode (anode), because DNA is negatively charged
CNeither electrode, since DNA is neutral
DBoth electrodes equally, the field randomises movement
Answer & Solution
Correct answer: B. Positive electrode (anode), because DNA is negatively charged
DNA has a negatively-charged phosphate backbone, so it moves toward the POSITIVE electrode (anode). Smaller fragments migrate faster through the gel pores. EtBr or SYBR Green stains DNA for UV visualisation.
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