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Operon is the cluster of genes that are involved in the process of gene expression. It is the gene expression mechanism found in prokaryotes. Examples of the operon are lac operon and trp operon.

Repressors are the molecule that binds to the operator of the gene. The repressor鈥檚 mutation may change the repressor鈥檚 shape that cannot bind to the promoter.

The irreversible binding of the repressor and promoter does not take place when the repressor is mutated.

Therefore, the given option is false.

The mutation of the repressor will over-activate the transcription process. It will not reduce the transcription rate.

The reduction in the transcription of operon does not happen by the mutation of the repressor.

Therefore, the given option is false.

The building of the substrate does not happen by mutating the repressor. The blockage of the repressor tends to keep the metabolism active, which may result in the utilization of the substrate.

The accumulation of substrate does not take place due to the mutation of the repressor in the operon.

Therefore, the given option is false.

The mutation of the repressor does not allow it to bind to the operator region. The work of the operon will not stop due to the mutation of the repressor. The operon continues working by carrying out the mechanism within the cell.

The operon remains active by the overactivation of transcription of genes that result from the mutation of the repressor.

Therefore, the given option is true.