Which is least likely to occur in a non-mutant bacterial cell?
A) $\beta$-galactoside transacetylase is present at a high concentration when $\beta$-galactoside is present at a low concentration.
B) $\beta$-galactoside transacetylase is produced at very low levels in the absence of lactose.
C) $\beta$-galactoside transacetylase is produced at very low levels when glucose is abundant.
D) $\beta$-galactoside transacetylase is produced at high levels when lactose is at a high concentration and glucose is not available.
E) $\beta$-galactoside transacetylase and β-galactoside are both present in very low concentrations.

Question

Quizplus · Accepted Answer

In a non-mutant bacterial cell, the production of enzymes like β-galactosidase transacetylase is regulated by the presence of its substrate (e.g., lactose) and the absence of glucose, due to the lac operon's regulation mechanisms. High enzyme concentration in the presence of low substrate concentration (choice A) contradicts this regulatory mechanism, making it the least likely scenario.

Which Is Least Likely to Occur in a Non-Mutant Bacterial β\betaβ

Which Is Least Likely to Occur in a Non-Mutant Bacterial $\beta$