Plasmids are suitable vectors for gene cloning because

  • A
    These are small circular $DNA$ molecules,which can integrate with host chromosomal $DNA$
  • B
    These are small circular $DNA$ molecules with their own replication origin site
  • C
    These can shuttle between prokaryotic and eukaryotic cells
  • D
    These often carry antibiotic resistance genes

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$A$ helper virus is defined as:

Statement-$I$: Thermostable $\text{DNA}$ polymerase is isolated from $\text{Thermus aquaticus}$.
Statement-$II$: $\text{Taq}$ $\text{DNA}$ polymerase is inactive at high temperature $(72^{\circ}\text{C})$.

Which of the following is a wrong match?

Cutting of a piece of $DNA$ from a plasmid was done with the help of $...A...$ enzymes,popularly known as $...B....$ Here $A$ and $B$ can be

Restriction endonucleases are

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