Select the incorrect statment (1) Separation of DNA fragments occur according to their size duri...

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Select the incorrect statment
(1) Separation of DNA fragments occur according to their size during gel electrophoresis
(2) Ethidium bromide is used to stain DNA
(3) Downsteam processing includes the separation and purification of product
(4) pBR322 contains the coding sequence of an enzyme \( \beta \)-galactosidase
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