Select the incorrect statement. (1) Separation of DNA fragments occurs based on their size in ag...

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Select the incorrect statement.
(1) Separation of DNA fragments occurs based on their size in agarose gel.
(2) Blue-white selection involves insertional inactivation of \( \beta \)-galactosidase gene.
(3) Treatment with ice-cold calcium can enhance efficiency of transformation in host cells.
(4) Extension step during PCR is based on thermolabile nature of Taq polymerase.
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