Which of the following techniques has made genetic engineering possible for living organisms?

  • A
    Hybridization
  • B
    Recombinant $DNA$ technology
  • C
    $X$-ray diffraction
  • D
    Heavy isotope labeling

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Two enzymes responsible for restricting the growth of bacteriophages in $E. coli$ were isolated. One was methylase and the other was restriction endonuclease. What is the significance of methylase?

An enzyme catalyzing the removal of nucleotides from the ends of $DNA$ is

Enzyme used for the extension process in the $PCR$ method.

The specific palindromic sequence which is recognized by $EcoRI$ is:

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