[" 174.The colonies of recombinant bacteria appear white "],[" in contrast to blue colonies of non-recombinant "],[" bacteria because of :- "],[" (1) Inactivation of glycosidase enzyme in rectosidase "],[" (2) Non-recombinant bacteria contain-galactosidase in "],[" (3) Insertional inactivation of alpha-galactosidase in "],[" (3) Insertional inactivation of alpha-galactosidase in "],[" (4) Insertional inactivation of beta-galactosidase in "],[" recombinant bacteria "]