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HomeHomework HelpbiologyOperon Control

Operon Control

Operon control is a type of gene regulation in which a cluster of coordinately regulated genes, including structural and regulatory genes, are controlled by regulatory proteins and sites, such as promoters and operators. This control can be either positive, where genes are expressed only in the presence of an activator, or negative, where genes are expressed unless switched off by a repressor protein.

intermediate
2 hours
Biology
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Overview

Operon control is a fundamental concept in molecular biology that explains how bacteria regulate gene expression. By grouping genes together under a single promoter, bacteria can efficiently respond to changes in their environment, such as the availability of nutrients. This system is crucial for su...

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Key Terms

Operon
A cluster of genes under the control of a single promoter.

Example: The lac operon in E. coli.

Promoter
A DNA sequence where RNA polymerase binds to initiate transcription.

Example: The promoter region of the lac operon.

Repressor
A protein that inhibits gene transcription by binding to the operator.

Example: LacI is a repressor for the lac operon.

Inducer
A molecule that initiates gene expression by disabling the repressor.

Example: Allolactose acts as an inducer for the lac operon.

Operator
A segment of DNA where a repressor can bind, blocking transcription.

Example: The operator in the lac operon.

Structural Genes
Genes that code for proteins, which are expressed as part of the operon.

Example: LacZ, LacY, and LacA in the lac operon.

Related Topics

Gene Regulation
The mechanisms that control the expression of genes in organisms.
intermediate
Transcriptional Control
How transcription is regulated in cells, affecting gene expression.
intermediate
Bacterial Genetics
The study of genetics in bacteria, including gene transfer and mutation.
advanced

Key Concepts

Gene regulationPromoterRepressorInducer