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What problem occurs in selection if a plasmid lacks a selectable marker?

Answer and explanation

Correct answer: Identifying transformants will be difficult

The direct answer is A: identifying transformants will be difficult. A selectable marker is a gene that gives transformed cells a detectable survival or growth advantage, commonly resistance to a particular antibiotic under controlled laboratory conditions. After transformation, only some cells may receive the plasmid. When the appropriate selection is applied, cells carrying the marker can be distinguished from cells that did not receive the plasmid. Without a marker, transformed and non-transformed cells may look alike, so screening becomes difficult and may require another independent method. Option B is wrong because DNA does not automatically become protein merely because a marker is absent. Option C is wrong because the host will not always die. Option D is wrong because an agar plate does not become liquid for this reason. Remember: no marker means no easy selection signal.

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Selectable MarkerSelectionTransformants

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