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Why can a reporter gene be disrupted when an insert enters the MCS?

Answer and explanation

Correct answer: The MCS can be inside the reporter gene

The governing concept is insertional inactivation used in recombinant DNA screening. In many cloning vectors, the multiple cloning site, or MCS, is placed within a reporter sequence such as the lacZ region. If foreign DNA is inserted at that site, the inserted sequence interrupts the reporter gene or its reading frame, so the reporter product may no longer be formed or may lose activity. This change can help distinguish recombinant clones from non-recombinant ones, for example through blue-white screening. Option A is correct. The other options describe unrelated effects: water availability, conversion of DNA into protein, and agar chemistry do not explain reporter-gene disruption.

Related tags

McsLaczInsertional InactivationBlue-White ScreeningCloning VectorsPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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