Inducible and repressible systems are similar in that
A) in both systems the regulatory molecules function by binding to the operator.
B) both systems usually control biosynthetic pathways.
C) both systems usually control catabolic pathways.
D) both systems block transcription through the presence of a regulatory protein.
E) both systems are unique to prokaryotes.

Question

Quizplus · Accepted Answer

Inducible and repressible systems both involve regulatory molecules that bind to the operator to control gene expression. In inducible systems, the regulatory molecule (inducer) stimulates transcription by binding to the repressor, preventing it from binding to the operator. In repressible systems, the regulatory molecule (corepressor) inhibits transcription by binding to the repressor, making it able to bind to the operator.

Inducible and Repressible Systems Are Similar in That