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?

White
Brown
No colour is produced
Blue

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Immunological Techniques
In Rocket Immunodiffusion the length of the rocket is

proportional to the amount of antibody placed in each well
inversely proportional to the amount of antibody placed in each well
inversely proportional to the amount of antigen placed in each well
proportional to the amount of antigen placed in each well

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