Teaching Haryana (HPSC) Assistant Professor Mock Test 2025 Life Sciences Fundamental Processes Control of gene expression
Which of the following best describes the regulation of the lac operon in the presence of both lactose and high levels of cAMP?
1
The operon is repressed because of the lac repressor binding to the operator.
2
The operon is fully activated, as lactose removes the repressor and cAMP-CAP binding enhances transcription.
3
Transcription is partially activated since cAMP prevents lactose from acting as an inducer.
4
The operon is inactive because cAMP inhibits the RNA polymerase binding.
5
Question Not Attempted