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In prokaryotic gene expression, regulation is essential to conserve energy and adapt to environmental changes. Gene expression is primarily controlled at the transcriptional level through positive and negative control mechanisms, which involve regulatory proteins interacting with DNA sequences near the promoter to modulate RNA polymerase activity. Negative Control Mechanisms: Negative control involves a repressor protein that binds to an operator sequence or regulatory binding site to block transcription. The repressor prevents RNA polymerase from transcribing the downstream structural genes. Negative control can operate in two main ways: inducible and repressible systems. * Inducible Negative Control: In this system, the operon is normally off, and transcription occurs only in the presence of an inducer molecule that inactivates the repressor. A classic example is the lac operon. The lac operon contains genes for _________ ____ __________ ____ ____ ____.
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