The operon model explains the regulatory system of the gene expressions in the bacteria. An inducible enzyme will be synthesized if the substrate binds to the repressor. Thus, option B is correct.
An operon model is the representation of the genes that are closely related and is the regulation of the genetic mechanism in the bacteria. They consist of the structural gene, an operator, and a promoter.
The inducible enzyme in the operon model is produced if the substrate binds to the repressor. The substrate act like an inducer to promote the transcriptional process by inhibiting the activity of the repressor.
The inhibited repressor will not be able to bind the operator and hence RNA polymerase will be free to move and complete the process of transcription in bacteria and viruses.
Therefore, the substrate binds to the repressor so that an inducible enzyme is produced.
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