Choose the incorrect statement :

Transformation is a procedure through which a piece of DNA is introduced into a host bacterium

Normally the genes encoding resistance to antibotics like ampicillin, chloramphenicol, tetracycline, kanamycin, etc., are considered useful selectable markers for E.coli

The normal E. coli cells carry genes resistant against ampicillin, chloramphenicol, tetracycline and kanamycin 

In order to link the alien DNA, the vector needs to have very few, preferably single, recognition site for the commonly used restriction enzymes