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The colonies of recombinant bacteria appear white because of:

1.	Insertional inactivation of alpha-galactosidase in non-recombinant bacteria
2.	Insertional inactivation of beta-galactosidase in recombinant bacteria
3.	Inactivation of glycosidase enzyme in recombinant bacteria
4.	Non-recombinant bacteria containing beta-galactosidase

Subtopic: Selectable Markers: III | Selection of Recombinant Transformants | Selectable Markers |

81%

Level 1: 80%+

AIPMT - 2013

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