The polycistronic Histidine Operon in E. coli encodes all of the proteins necessary for the biosynthesis of the amino acid histidine. His X is a separate operon that encodes the His X protein. His X regulates the His Operon by positive regulation. The fact that His X engages in positive regulation means that His X promotes RNA pol binding to the His Operon promoter His X might promote or inhibit RNA pol binding to the His Operon promoter depending on how histidine affects His X DNA binding ability E. coli transcribes the His Operon only when histidine levels are high E. coli transcribes the His Operon only when histidine levels are low His X blocks RNA pol binding to the His Operon promoter

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Learning and memory

Learning is defined as a relatively permanent and irreversible adaptive change in behavior. It always results from experience. The ability of an organism to store and recall the effects, sensations, and knowledge gained through learning and experience is called memory.