Inducible and Repressible Systems Are Similar in That

Multiple Choice

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.