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The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of 

(1) Non-recombinant bacteria containing β-galactosidase

(2) Insertional inactivation of α-galactosidase in non-recombinant bacteria

(3) Insertional inactivation of α-galactosidase in recombinant bacteria

(4) Inactivation of glycosidase enzyme in recombinant bacteria

 

NEET