Immunological Techniques
The IPTG is a gratuitous inducers of (β-galactosidase, and x-gal is a chromogenic substrate. When α-complementation occurs which colour is produced?

No colour is produced
Blue
White
Brown

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Immunological Techniques
In Counter immunoelectrophoresis

electrophoresis will drive the antibody and antigen parallel to each other
the antibody will migrate towards anode
electrophoresis will drive the antibody and antigen toward each other
the antibody will migrate towards cathode

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