A mutant strain of E . coli produces β-galactosidase in both...

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Key Concepts

Operon Structure

An operon is a group of functionally related genes that are transcribed together under the control of a single promoter. This organization allows coordinated regulation of gene expression, ensuring that proteins needed for a particular function are produced simultaneously. The operon includes both coding regions (structural genes) and regulatory regions that control transcription.

Regulatory Sequences (Operator)

The operator is a specific DNA segment within an operon where regulatory proteins, such as repressors, bind to influence gene transcription. In many bacterial operons, including those involved in metabolism, the repressor binds to the operator under certain conditions to prevent transcription. A mutation in the operator can disrupt this binding, leading to unregulated, or constitutive, expression of the downstream genes.

Constitutive Gene Expression

Constitutive gene expression refers to the continuous production of a gene’s product irrespective of environmental factors or the presence of inducers. In the context of operon regulation, a mutation that prevents a repressor from binding to the operator can cause the operon’s genes to be expressed at all times, bypassing normal regulatory signals such as the presence or absence of specific substrates.

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