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What should be the best result of a negative control in competent-host work?

Answer and explanation

Correct answer: No growth on selection plate

In this control, competent cells are handled through the transformation procedure but are not given the plasmid carrying the relevant selectable marker. The governing principle is that the selection plate should suppress cells lacking that marker. Consequently, no growth is the best expected result, making option A correct. This result supports the conclusion that the antibiotic or other selection condition is functioning and that the plate is not obviously contaminated. Very high growth would suggest failed selection or contamination; blue colonies are relevant only to a separate reporter-screening system; and a DNA band is not the defining readout of this control. A control result should always be interpreted alongside the positive control.

Related tags

Negative ControlNo GrowthSelectionCompetent HostPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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