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An **inducible operon (such as the lac operon) is normally off but can be activated by an inducer** like lactose. This follows from NCERT principle where relation explains outcome clearly for students.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Biology - Botany portion covering relevant concept, Topic: Plant structure, physiology and applications.
An inducible operon, like the lac operon, is normally off but can be activated by an inducer (e.g., lactose).
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Regulation of Gene Expression - Lac Operon
An inducible operon (such as the lac operon) is normally off but can be activated by an inducer like lactose.
Ref: NCERT Class 12 Biology Chapter 5: Molecular Basis of Inheritance Regulation of Gene Expression - Lac Operon
Arabinose operon exemplifies inducible catabolic system controlling pentose sugar utilization in Escherichia coli. Genes remain transcriptionally silent without substrate because apo-AraC regulator forms DNA loop repressing PBAD promoter activity. Presence of L-arabinose sugar converts regulatory protein into transcriptional activator capable of recruiting polymerase. Operon therefore defaults off state, switched on only upon metabolite accumulation, similar regulatory logic to lac induction by allolactose inducer and distinct from trp repressible anabolic logic where end product shuts off. Ad
Ref: Wikipedia L-arabinose operon – araBAD inducible operon regulated by AraC and CAP-cAMP catabolite control.
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