|1.||a person or thing that promotes|
|2.||a person who helps to organize, develop, or finance an undertaking|
|3.||a person who organizes and finances a sporting event, esp a boxing match|
|4.||chem a substance added in small amounts to a catalyst to increase its activity|
|5.||genetics a sequence of nucleotides, associated with a structural gene, that must bind with messenger RNA polymerase before transcription can proceed|
promoter pro·mot·er (prə-mō'tər)
A substance that increases the activity of a catalyst.
A DNA molecule to which RNA polymerase binds, initiating the transcription of mRNA.
A chemical that may promote carcinogenicity or mutagenicity.
|promoter (prə-mō'tər) Pronunciation Key
The region of an operon that acts as the initial binding site for RNA polymerase.
in chemistry, substance added to a solid catalyst to improve its performance in a chemical reaction. By itself the promoter has little or no catalytic effect. Some promoters interact with active components of catalysts and thereby alter their chemical effect on the catalyzed substance. The interaction may cause changes in the electronic or crystal structures of the active solid component. Commonly used promoters are metallic ions incorporated into metals and metallic oxide catalysts, reducing and oxidizing gases or liquids, and acids and bases added during the reaction or to the catalysts before being used.
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