Select the correct statement from the following.

  • A
    Nucleic acid is the genetic material in all living organisms.
  • B
    $DNA$ must be in pure form to be cut by restriction enzymes.
  • C
    The structure of $DNA$ contains four types of nucleotides.
  • D
    All of the above.

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Which of the following is used as a screening agent in the replica plating experiment?

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