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Why can equal mass fragments show different brightness in restriction digest?

Answer and explanation

Correct answer: Due to stain binding and imaging conditions

Band brightness is an observation produced by staining and imaging, not a direct and perfect measurement of DNA mass. Even fragments with equal mass can appear different because dye binding may vary with fragment structure, local conditions, staining time, destaining, gel thickness, and the position of the band. The imaging system also contributes through exposure, focus, background fluorescence, and detector response. In addition, a band’s apparent intensity can be affected by overlap or diffusion. Therefore brightness should be interpreted together with the molecular-size ladder and experimental controls rather than treated as an exact mass scale. DNA is not protein, enzyme colour is irrelevant, and water volume cannot explain the stated general effect.

Related tags

Band BrightnessStain BindingImagingCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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