Question

Galactosides coding sequence act as a selectable marker

Answer 1

Explanation:

inserted within the coding sequence of an enzyme, b galactosidase, which results into activation of the enzyme referred as insertional inactivation coding sequence for the enzyme b-galactosidase is preferred over antibiotic resistance genes because recombinants can be easily visualised.

Answer 2

Answer:

β-galactosidase, also called lactase, beta-gal or β-gal, is a glycoside hydrolase .... in trans another mutant gene encoding the LacZΩ in specific laboratory strains of E. coli.