Which of the following statements is correct regarding the $DNA$ polymerase used in $PCR$?

  • A
    It is isolated from a virus.
  • B
    It remains active at high temperatures.
  • C
    It is useful in the ligation of $DNA$ inserted into a host cell.
  • D
    It acts as a selectable marker.

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Give the types and functions of the Nuclease enzyme.

Which of the following $DNA$ sequences can be cut by a restriction endonuclease?

$A$ : $DNA$ ligase plays an important role in recombinant $DNA$ technology.
$R$ : The linking of antibiotic resistance gene with plasmid vector became possible by enzyme $DNA$ ligase.

Discuss with your teacher and find out how to distinguish between (Any two):
$(a)$ Plasmid $DNA$ and Chromosomal $DNA$
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$(c)$ Exonuclease and Endonuclease

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