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9.       Quorum sensing (QS)
a.       is a unique characteristics of biofilm.
b.       provides communication among bacteria via molecules released into the environment.
c.       regulates gene expression including virulence gene expression.
d.       all the above.

A．a.       is a unique characteristics of biofilm.
B．b.       provides communication among bacteria via molecules released into the environment.
C．c.       regulates gene expression including virulence gene expression.
D．d.       all the above.