Скачать или смотреть The Lac Operon | Complete Genetics | CSIR | GATE | Pre-medical - NEET/AIIMS

Bacteria are typically exposed to an ever-changing environment in which nutrient availability may increase or decrease radically. Bacteria respond to such variations in their environment by altering their gene expression pattern; thus, they express different enzymes depending on the carbon sources and other nutrients available to them. It would be wasteful to synthesize, for example, lactose-metabolizing enzymes in the absence of lactose. However, when lactose is the only available carbon source, bacteria must quickly induce lactose-metabolizing enzymes, or else they will die. In bacteria, this sort of genetic regulation is mediated at the level of transcription.
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