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Why is DNA stain used in a gel?

Answer and explanation

Correct answer: To visualize DNA bands

A DNA stain, such as ethidium bromide or another fluorescent dye, binds to DNA and makes it visible as bands under UV or blue light. It is therefore used to observe the positions of DNA fragments after gel electrophoresis. Cutting DNA is the role of a restriction enzyme, not a stain. Exam tip: remember that stains help visualise DNA bands, whereas restriction enzymes cut DNA.

Related tags

Dna StainGel ElectrophoresisDna BandsFluorescent DyeRecombinant Dna TechnologyCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnology

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