AP Biology· difficulty 3/5
The lac operon is _______ (turned on by lactose); the trp operon is _______ (turned off by tryptophan).
Both inducible
Repressible; inducible
Both repressible
Inducible; repressible
Explanation
lac = inducible (substrate turns it on); trp = repressible (end product turns it off).
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