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Gel band intensity is mainly related to what?

Answer and explanation

Correct answer: DNA mass in that band

The direct answer is A: gel-band intensity is mainly related to the amount, or mass, of DNA present in that band. DNA stains bind to nucleic acid, so more DNA usually produces a brighter signal under the imaging conditions. Step by step: DNA fragments separate in the gel; a stain binds to the separated DNA; the detector records fluorescence or color; a band containing more total DNA generally appears more intense. Concentration and fragment size both matter because total mass is approximately concentration multiplied by volume, and staining or imaging may not be perfectly linear. A is correct. B is wrong because enzyme taste has no role in DNA staining or electrophoresis. C is wrong because tube color does not determine the DNA amount in a band. D is wrong because water smell is irrelevant. Intensity is not a perfect measurement of exact quantity without standards, so compare carefully. Memory cue: “brighter usually means more DNA, not necessarily a larger fragment.”

Related tags

Band IntensityDna MassGel

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