Following are the properties of a good vector :
(1) Its isolation and purification should be simple and convenient.
(2) It can be successfully inserted into the host cell, that is, its transformation should be efficient and simple.
(3) It has to express the desired DNA, hence it is necessary to have regulatory elements like promoter, operator and other necessary sequences present in the vector.
(4) For gene transformation, the vector must have the ability to integrate either itself or its DNA input into the host chromosome.
(5) It should contain suitable reporter genes so that transformed host cells can be easily selected.