Question

based on the current understanding of this operon, which hypothesis would be useful for james to test?
addition of allolactose (inducer) to the bacterial growth media should increase the speed at which the bacteria metabolize the sugar lactose.
removal of the rna polymerase molecule should increase the amount of bacterial growth on the plate.
decreasing the amount of allolactose (inducer) in the bacterial growth media should increase the rate of bacterial growth.
increasing the rate at which rna polymerase acts will inhibit bacterial growth.

Explanation:

The diagram shows the lac operon. Allolactose (inducer) binds to the repressor, making it inactive, so RNA polymerase can transcribe genes for lactose metabolism (lacZ, lacY, lacA produce enzymes like β - Galactosidase for lactose breakdown).

• Option 1: Adding allolactose should activate the operon, increasing lactose metabolism speed. This matches lac operon function.
• Option 2: Removing RNA polymerase would stop transcription, reducing growth (needs gene products), so this is wrong.
• Option 3: Decreasing allolactose would keep the repressor active, reducing lactose metabolism and likely growth, so wrong.
• Option 4: Increasing RNA polymerase rate would increase transcription of metabolic genes, promoting growth, not inhibiting, so wrong.

Answer:

A. Addition of allolactose (inducer) to the bacterial growth media should increase the speed at which the bacteria metabolize the sugar lactose.