In gene regulation, what is the usual state of a repressible operon?
A) It is usually turned on, and binding of a repressor shuts it off
B) It is usually turned off, and binding of an inducer turns it on
C) It is usually turned off, and formation of an initiation complex turns it on
D) It is usually turned on, regardless of the presence of the repressor
E) It is impossible to tell unless you know if the genes are being transcribed
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B) It is usually turned off, and binding of an inducer turns it on
1 answer