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Why is high-quality plasmid preparation necessary in restriction digestion?

Answer and explanation

Correct answer: To obtain a clear and reliable band pattern

The governing concept is that restriction enzymes require a clean, intact DNA substrate and suitable reaction conditions. A high-quality plasmid preparation contains sufficient supercoiled or otherwise intact plasmid and has low levels of salts, phenol, ethanol, detergents, proteins, and genomic DNA contamination. Such contaminants can inhibit the enzyme or interfere with loading and migration, causing incomplete digestion, unexpected bands, or a diffuse pattern. Therefore option A is correct: clean plasmid DNA supports a clear and interpretable result. The purpose is not protein production, ethanol increase, or buffer-free electrophoresis. A control containing undigested plasmid alongside the digested sample is useful because plasmid topology can produce different forms and helps interpretation.

Related tags

Plasmid PreparationRestriction DigestionGel BandsIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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