← ap bio 18 47 part 3 Export Options Alphabetize Word-Def Delimiter Tab Comma Custom Def-Word Delimiter New Line Semicolon Custom Data Copy and paste the text below. It is read-only. Select All operon vacillates between two states: one without repressor bound and one with repressor bound allosteric protein two alternative shapes, active and incative corepressor molecule that cooperates with a repressor protein to switch an operon off repressible operon operon thats transcription can be inhibited inducible operon usually off but can be stimulated when molecule interacts with regulatory protein