The tryptophan operon contains the genes needed for the expression of the enzymes used in tryptophan synthesis. Tryptophan is normally turned on and will continuously produce tryptophan until the excess tryptophan available that would signal the operon to switch it off.
In an E. coli mutant carrying a deletion of the trp operator sequence..
A. transcription of the trp operon will proceed in the presence or absence of tryptophan.
B. the trp repressor will always be active.
C. no translation of trp operon genes will occur in the presence or absence of tryptophan.
D. no transcription of the trp operon will occur in the presence or absence of tryptophan.
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