試題詳解

36. How does the interaction between the lac repressor and the lac operator block transcription initiation?
(A) lac repressor binding blocks RNA polymerase from interacting with DNA at the start site.
(B) lac operator induces a conformational change in lac repressor.
(C) lac repressor binding causes a conformational change in RNA polymerase.
(D) lac operator blocks DNA polymerase from interacting with the transcription start site.
(E) lac repressor binding induces a protease that degrades the sigma subunit of RNA polymerase.