The ABC operon encodes three enzymes: A, B, and C. Upstream of the operon's promoter, there is an independent gene that encodes the regulatory protein $X$. A bacterial strain from which the gene encoding $X$ has been completely removed is found to be unable to transcribe the $A B C$ operon even in the presence of inducer. What can be concluded about this system?

Question

Accepted Answer

∻Answer∻ ⚹ The regulatory protein X is necessary for the transcription of the ABC operon, and it likely acts as an activator. ⚹ ∻Solution∻ ‖ a ⋮ Given information: The gene encoding regulatory protein X has been removed, and the ABC operon cannot be transcribed even with an inducer present. ‖ ‖ b ⋮ Conclusion: Since the operon cannot be transcribed without protein X, it suggests that X is essential for the transcription process, likely serving as an activator that responds to the inducer. ‖ ∻Key Concept∻ ⚹ Regulatory protein X is an activator for the ABC operon. ⚹ ∻Explanation∻ ⚹ The inability to transcribe the operon in the absence of protein X, despite the presence of an inducer, indicates that X is required to initiate transcription, characterizing it as an activator. ⚹◊How does the regulatory protein X impact the transcription of the ABC operon in bacteria?⍭ Generate me a similar question◊

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