Question

In E. coli cells of the genotype r pt oczyt ir pt ot z r. production of galactosidase and permease will be respectively) A. inducible, constitutive B. constitutive, constitutive O lethal, conditional D. dominant, recessive O E. constitutive, inducible

Answer 1

Lactose Present I Lactobe absent in envirconment Genotype of fron environment Strain B-galactosidasel Peremease 2-galactosidase) Perimease I-proczy+ + Cres) + Yes) | t. fres) + (res) In protety- Ang were & option By constitutive, constitutive Explanation! Regulator gene controls the activity of operator gene for producing repressor molecule. But there regulator gene is defective and operator is constituture. 30 operator can constite Cutively produce egalactosidase and permease in the presence for abfence of inducer, there was no repressor molecule for preventing the production of galactosidase and peromease. So Both is produced constitutively.