AP Biologymediummcq1 pt
The trp operon is described as repressible because
A.tryptophan acts as a corepressor that activates the repressor
B.tryptophan always activates transcription
C.it is induced by lactose
D.it has no operator
Explanation
Core Concept
The trp repressor binds the operator only when tryptophan is plentiful, shutting down synthesis of what the cell no longer needs — default on, turned off by product.
Correct Answer
Atryptophan acts as a corepressor that activates the repressor
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