Select the incorrect statement.

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(B) $1$. The origin of replication $(ori)$ is a specific sequence in $DNA$ where replication initiates and it also controls the copy number of the lin

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The $tet^R$ gene is responsible for the production of tetracycline.

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(B) $1$. The origin of replication $(ori)$ is a specific sequence in $DNA$ where replication initiates and it also controls the copy number of the linked $DNA$. Thus,statement $A$ is correct.$2$. The $tet^R$ gene provides resistance to the antibiotic tetracycline; it does not produce the antibiotic itself. Thus,statement $B$ is incorrect.$3$. The $Ti$ plasmid (Tumor-inducing plasmid) of Agrobacterium tumefaciens is widely used as a cloning vector to deliver genes into plants. Thus,statement $C$ is correct.$4$. Agrobacterium tumefaciens is a natural pathogen of several dicot plants,as it can transfer a piece of $DNA$ known as '$T-DNA$' to transform normal plant cells into a tumor. Thus,statement $D$ is correct.

Column-$I$	Column-$II$
$(a)$ Ligase	$(i)$ It removes nucleotides from $DNA$ ends.
$(b)$ Endonuclease	$(ii)$ Connects parts of $DNA$.
$(c)$ Exonuclease	$(iii)$ Removes phosphates from $DNA$.
$(d)$ $DNA$ Polymerase	$(iv)$ It produces sticky ends in $DNA$.
	$(v)$ Useful for repeated amplification.

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