Synthesis of a repressible enzyme is stopped by?

Question

A.
The allosteric transition.
B.
The substrate binding to the repressor.
C.
The corepressor binding to the operator.
D.
The corepressor-repressor binding to the operator.
E.
The end-product binding to the promoter.

Answer 1

D. i think, i'm not 100% sure, because i'm actually only a high school student, and havne't actually taken a molecular bio course. repressors work by binding to operators. I'm not 100% what a corepressor is, but if they're anything like coenzymes, then they're just factors which are needed for the repressor to work, but will not work on its own. thus, the answer would be D and not C

Answer 2

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RE:
Synthesis of a repressible enzyme is stopped by?
A.
The allosteric transition.
B.
The substrate binding to the repressor.
C.
The corepressor binding to the operator.
D.
The corepressor-repressor binding to the operator.
E.
The end-product binding to the promoter.