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What is the risk of leaving a DNA sample open after isolation?

Answer and explanation

Correct answer: Contamination and evaporation

An isolated DNA sample should be kept closed because exposure to the environment creates two immediate risks: contamination and evaporation. Dust, microorganisms, aerosols, nucleases, or accidental contact can introduce foreign material and reduce sample quality. If water evaporates from an open tube, the volume decreases and the DNA becomes more concentrated, which can make pipetting and concentration calculations inaccurate; prolonged exposure may also damage the sample. Therefore option A is correct. Opening a tube does not automatically amplify DNA, fold proteins, or guarantee cell growth. Proper labelling, sealing, and recommended storage conditions protect the isolated DNA.

Related tags

Dna Sample HandlingContaminationEvaporationIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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