Birefringent particles or particles like talc, silica and urate are examined using: polarized light
ultraviolet light
electron microscopy
dark field illumination

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answer; i believe the answer is hydraulic action;

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation: