Which of the following statements is not correct about a cloning vector?
- A$Ori$ is a sequence responsible for controlling the copy number of the linked $DNA$.
- BSelectable marker selectively permitting the growth of the non-transformants.
- CIn order to link the alien $DNA$,the vector needs to have a single recognition site for the commonly used restriction enzymes.
- DThe ligation of alien $DNA$ is carried out at a restriction site present in one of the two antibiotic resistance genes.
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