Drag the terms to their matching descriptions to review gene regulation in prokaryotes. (Note that not all terms have a match.) repression A gene fusion where the reulatory region of one gene is fused to the open reading frame of another gene whose protein product is easy to detect. allosteric protein A preferred sugar prevents transcription of a sugar-metabolizing operon. attenuation A protein that changes its conformation upon binding to another molecule, such as a repressor that binds to an inducer. operon Stimulation of transcription by a specific molecule. RNA leader sequence Prevention of gene expression by a specific protein that binds to an operator. catabolite repression A cluster of genes transcribed together into a single mRNA and regulated as a group. reporter gene reverse transcriptase Premature termination of transcription in response to translation of an RNA leader. constitutive mutant An untranslated region at the 5' end of a bacterial mRNA induction A strain that synthesizes certain enzymes regardless of environmental conditions. DNA polymerase

A regulator gene, regulator or control gene, is a gene involved in controlling the expression of one or more other genes. Regulatory sequences that encode regulatory genes are often located at her fifth end of the transcription start site of the genes they regulate.

Regulatory elements are sequences of DNA that are recognized and bound by specific transcription factors to recruit or exclude RNA polymerase. Promoters co-regulate gene transcription with nearby transcription factor-binding elements. Regulatory DNA sequences also encode important functions. They control when, where and how many genes are expressed. To do this, they encode 'landing pads', or binding sites for transcription factor proteins. Transcription factors recruit the molecular machinery that transcribes genes.

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