In the tryptophan operon, the repressor actively binds to the operator when:a. tryptophan binds to ...

In the tryptophan operon, the repressor actively binds to the operator when:a.
   tryptophan binds to an allosteric site on the repressor.
  b. tryptophan levels are low.
  c. lactose levels are low.
  d. there is a great need for proteins.
  e. allotryptophan levels are low.

Question 2

A repressible operon is usually controlled by:
  a. an inactive repressor that allows it to be in the on state.
  b. the supply of the precursor product for the enzymes.
  c. an inactive repressor that keeps it in the off state.
  d. tryptophan.
  e. being turned on, usually by the end product of the pathway.