Study notes for midterm

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Department
Molecular Genetics and Microbiology
Course
MGY377H1
Professor
William Navarre
Semester
Fall

Description
17 Bacteria produce and can detect small freely diffusible signal moleculesautoinducersMethod of determining how many bacteria exist in environmentcalled quorum sensing When enough bacteria present autoinducer concentration sufficient Regulatory proteins bind the signal molecule and activate transcription directly or indirectly Low density no signal High density signal activation Quorum sensing Allows bacteria to switch between two distinct gene expression programs One is favoured at lowcell density for individual asocial behaviours Another is favoured at highcelldensity for social group behaviours Many important functionsbiofilm formation virulence gene expression sporulation motility mating EX Vibrio harveyi vibrio fisheri Bacteria make light in specialized organs of fish and squid Bacteria make light only in light organsymbiotic relationship with host Autoinducers of gramnegative bacteria are small organic compoundsAut
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