If you were given a bacterial strain with a mutation in the promoter region of the trp operon, the most likely effect would be
A. to block the repressor from binding.
B. interference with RNA polymerase binding.
C. derepression of the trp operon.
D. lack of expression of just the first gene in the operon.
E. enabling the trp operon to be expressed in the absence of tryptophan.
Answer: B
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