In the lac operon of E. coli
A) the presence of $\beta$-galactosidase stimulates transcription of mRNA.
B) lacO is trans-acting.
C) lacI produces a protein inducer.
D) the presence of lactose induces expression of the lac genes.
E) All of the answers are correct.

Question

Quizplus · Accepted Answer

The lac operon in E. coli is an inducible system where the presence of lactose induces the expression of the lac genes, including those coding for β-galactosidase, by inactivating the repressor protein that normally inhibits transcription.

In the Lac Operon of E β\betaβ -Galactosidase Stimulates Transcription of MRNA

In the Lac Operon of E $\beta$ -Galactosidase Stimulates Transcription of MRNA