r-$DNA$ is inserted within the coding sequence of an enzyme,$\beta$-galactosidase. This results in the inactivation of the gene for the synthesis of this enzyme,which is referred to as . . . . . . .

  • A
    Insertional inactivation
  • B
    Recombinant inactivation
  • C
    Insertional activation
  • D
    Combined inactivation

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$III.$ Agarose
$IV.$ $UV$ radiation
Choose the correct option:

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In gel electrophoresis,the separated bands of $DNA$ are cut out and extracted from the gel piece. This step is called

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