[Campbell Biology P.446] What is the most likely outcome if the repressor of an inducible op... | Practice Question

What is the most likely outcome if the repressor of an inducible operon is mutated such that it can no longer bind to the operator?

  • A: Irreversible binding of the repressor to the promoter.
  • B: Reduced transcription of the operon's genes.
  • C: Buildup of a substrate for the pathway controlled by the operon.
  • D: Continuous transcription of the operon's genes.

Explanation

In an inducible operon, the repressor normally binds to the operator to prevent gene transcription. If this repressor is mutated and can no longer bind, the inhibition is removed, leading to continuous or constitutive transcription of the operon's genes, even in the absence of an inducer.