E. coli lac operon control by lacI is:
A) negative inducible.
B) negative repressible.
C) positive inducible.
D) positive repressible.
E) attenuation.

Question

Quizplus · Accepted Answer

The lac operon is controlled by the lacI gene, which encodes a repressor protein. This repressor binds to the operator region of the lac operon and inhibits transcription. When an inducer (such as allolactose) is present, it binds to the repressor, causing it to release from the operator, allowing transcription to proceed. This is an example of negative inducible control.

E. Coli Lac Operon Control by LacI Is