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Why is recovery given before antibiotic selection?

Answer and explanation

Correct answer: To give time for resistance marker expression

The direct answer is A: recovery gives time for the resistance marker to be expressed. Immediately after DNA uptake and heat shock, cells may be temporarily stressed or damaged. Even if a plasmid has entered, the resistance gene may not yet have produced enough resistance protein. During a non-selective recovery period, cells repair themselves, resume metabolism, and begin expressing the marker. When antibiotic selection is applied afterward, cells with sufficient resistance have a better chance to survive and form colonies. Option A is correct. Option B is wrong because recovery is not meant to burn DNA. Option C is wrong because drying would harm cells. Option D is wrong because melting agar is unrelated to marker expression. Exam cue: recovery is the bridge between transformation and selection; it allows repair and gene expression first.

Related tags

RecoveryAntibiotic SelectionMarker Expression

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