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A clone is antibiotic resistant and has a white colony. What can it generally indicate?

Answer and explanation

Correct answer: It may be a recombinant clone

The governing concept is antibiotic selection combined with blue-white screening. Antibiotic resistance generally indicates that the bacterial cell has taken up a plasmid carrying the corresponding resistance marker; this is evidence of transformation, not proof that the insert is present. If the cloning site lies within lacZ and the desired DNA insert disrupts lacZ, the cell may fail to produce functional beta-galactosidase and form a white colony on the appropriate indicator medium. Therefore option A is correct: an antibiotic-resistant white colony may be a recombinant clone. It is still a presumptive result and should be confirmed by colony PCR, restriction analysis, or sequencing.

Related tags

Blue-White ScreeningAntibiotic ResistanceRecombinant CloneCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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