Bacteria That Contain the Vector Plasmid PBluescript II Produce Blue

Bacteria that contain the vector plasmid pBluescript II produce blue colonies if grown in a special medium. If these bacteria contain recombinant DNA, inserted into the LacZ gene of the plasmid, they produce white colonies. This is useful because it

A) provides a way of mapping DNA segments.
B) identifies the plasmid from the bacterial DNA.
C) separates different genome fragments.
D) provides a way of identifying transformed bacteria.
E) identifies transposons integrated into the bacterial genome.

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