In the Bacterial Lac Operon,the Physiologically Regulated Step Is

Question

In the bacterial lac operon,the physiologically regulated step is:
A)DNA-binding by the transcriptional regulator.
B)activity of the activation-domain of the transcriptional regulator.
C)feedback inhibition by the end-product of the pathway.
D)import of the inducer molecule.
E)None of the answer options are correct.

Accepted Answer

The physiologically regulated step in the lac operon is the DNA-binding by the transcriptional regulator (the lac repressor), which is controlled by the presence or absence of the inducer (allolactose).