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If an expected band is absent in a restriction-digest gel, what can be a first possibility?

Answer and explanation

Correct answer: Incomplete digestion or an incorrect clone

A missing expected band is an observation that requires troubleshooting rather than an immediate conclusion. One first possibility is incomplete restriction digestion: insufficient enzyme, unsuitable buffer, incorrect incubation conditions, or inhibitors may leave some DNA uncut. Another possibility is that the tested colony is an incorrect clone and does not contain the predicted insert or restriction pattern. Low DNA quantity, loading problems, or an incorrect size expectation may also contribute, so controls and a DNA ladder are important. The absence does not prove perfection, convert DNA into protein, or remove the need for controls. Thus option A is the best answer.

Related tags

Restriction DigestMissing BandTroubleshootingCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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