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Lac Operon definitions

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  • Operon
    Cluster of functionally related genes transcribed together, mainly in prokaryotes, enabling coordinated gene regulation.
  • Lac Operon
    Genetic unit in bacteria responsible for lactose breakdown, containing genes, regulatory sequences, and control elements.
  • Promoter
    DNA region where transcription initiators bind, marking the start site for gene transcription within an operon.
  • Operator
    DNA segment acting as an on/off switch, where a repressor protein binds to control gene transcription.
  • Repressor
    Protein that binds to the operator, blocking transcription unless removed by a specific molecule like lactose.
  • Beta Galactosidase
    Enzyme encoded by lacZ, catalyzing the breakdown of lactose into glucose and galactose for cellular energy.
  • Permease
    Protein encoded by lacY, facilitating lactose entry into the cell, essential for lactose utilization.
  • Transacetylase
    Protein encoded by lacA, with a less understood but essential role in proper lactose digestion.
  • Catabolite Activator Protein
    Regulatory protein that, when bound to cAMP, enhances transcription of the lac operon in low glucose conditions.
  • cAMP
    Small molecule whose levels rise when glucose is low, enabling CAP to activate lac operon transcription.
  • Adenylyl Cyclase
    Enzyme inhibited by glucose, responsible for synthesizing cAMP, thus linking glucose levels to lac operon regulation.
  • Terminator
    DNA sequence signaling the end of transcription, ensuring proper completion of the operon's mRNA.
  • CAP Binding Site
    DNA region upstream of the promoter where the CAP-cAMP complex attaches to boost transcription.
  • Gene Regulation
    Cellular process controlling the timing and amount of gene expression, crucial for resource efficiency.
  • Lactose
    Sugar molecule that, when present, binds the repressor to allow transcription of genes for its breakdown.