Quorum Sensing and Bioluminescence in Bacteria

What is the primary function of quorum sensing in bacteria?

• To detect environmental changes

• To facilitate group behaviors at high cell density

• To enhance individual bacterial survival

• To produce toxins

How does Vibrio fischeri benefit the Hawaiian bobtail squid?

• By providing nutrients

• By helping the squid find food

• By producing light to avoid casting a shadow

• By cleaning the squid's skin

Why do Vibrio fischeri bacteria stop producing light in seawater?

• Because they run out of energy

• Because they are at low density and spread out

• Because they are eaten by predators

• Because they are in a dormant state

What role does the Lux I protein play in the Lux system?

• It detects environmental signals

• It binds to the operon to activate transcription

• It synthesizes the autoinducer

• It catalyzes the light-producing reaction

What is the result of the redox reaction catalyzed by luciferase in Vibrio fischeri?

• Production of heat

• Emission of blue-green light

• Formation of water

• Release of oxygen