Which Situation Is Least Likely to Occur in a Non-Mutant

Multiple Choice

Which situation is least likely to occur in a non-mutant bacterial cell?

A) β-galactoside permease is produced at very low levels in the absence of lactose.
B) β-galactoside transacetylase is produced at very low levels when glucose is abundant.
C) β-galactoside transacetylase is produced at high levels when lactose is at a high concentration and glucose is not available.
D) β-galactoside transacetylase and β-galactoside are both present in very low concentrations.
E) β-galactoside permease is absent when β-galactoside is present at a high concentration.