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What can cause a very faint band after restriction digestion?

Answer and explanation

Correct answer: Loading too little DNA into the gel

The correct answer is loading too little DNA into the gel. When the amount of DNA is low, it binds less stain and produces a weak signal, so the expected DNA-fragment band appears faint after digestion. An incorrect restriction enzyme usually gives an unexpected cutting pattern rather than being the most direct cause of a faint band. Exam tip: for a faint band, first check DNA concentration, loading amount, and staining conditions.

Related tags

Restriction DigestionDna FragmentsAgarose Gel ElectrophoresisDna LoadingFaint BandsRecombinant Dna TechnologyCutting Of DnaProcesses Of Recombinant Dna Technology

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