Respuesta :
The wild-type lacI protein acts as a repressor which is able to inhibit transcription from the lac operon.
So, the correct option is A.
A crucial role in the lac operon is played by the repressor protein LacI. In the absence of lactose and in the presence of glucose, the lac operon typically switches off, becoming inactive. The operon contains structural genes as well as an operator region and a promoter region. The lacI repressor attaches to the operator region when lactose is not present. Due to the existence of the repressor and the operator area's overlap with the promoter region, RNA polymerase is unable to bind to the promoter.
Lac operon genes are not transcriptionally transcribed. Allolactose is created in part when lactose is present. The LacI repressor changes form when allolactose attaches to it. The operon may now be actively transcribed by RNA polymerase since the repressor can no longer bind to the operator region.
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The given question is incomplete. The complete question is:
What does the wild-type lacI protein do?
a. Acts as a repressor (inhibits transcription from the lac operon).
b. Acts as an inducer (induces transcription from the lac operon).
c. Recruits RNA polymerase to the lac promoter.
d. Recruits RNA polymerase to the lac operator.
e. Acts as an inducer (induces transcription from the lac operon) and recruits RNA polymerase to the lac promoter.
