V. fischeri senses the density of V. fischeri cells in the environment by
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fischeri produces and releases signaling molecules called autoinducers into the environment as they grow and multiply. Show more…
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The diagram below is a model of the gene regulatory circuit for light production by $V$. fischeri cells. The lux operon contains genes for luminescence ( $l u x C D A B E$ ) and a gene, luxI , that encodes an enzyme that catalyzes the production of an inducer. This inducer easily moves back and forth across the plasma membrane and acts as a signaling molecule. The lux operon is never completely turned off. The luxR gene codes for the activator LuxR. The inducer can bind to LuxR, and when it does, the LuxR-inducer complex can bind to a regulatory site to activate transcription of the lux operon and inhibit transcription of $l u x R .$ Explain how this gene regulatory circuit accounts for bacteria emitting light only when they reach a high cell density.
Which statement about quorum sensing is TRUE? Select the best available answer. Group of answer choices: It measures the size of individual cells in a population. It depends upon the accumulation of signaling molecules called autoinducers. It will activate light production in all quorum-sensing species. It is a mechanism used by bacteria to promote group behaviors.
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