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7. A bacterium has one wild-type copy of the trp operon and a mutation in the trpR gene that doesn't allow the repressor to bind to its operator. There would be transcription of the trp operon when the cell is in a. a low tryptophan environment b. a high tryptophan environment c. both d. neither (Do not consider the effect of attenuation when answering this question). 8. A bacterium has one wild-type copy of the trp operon and a mutation in the operator sequence (O) that doesn't allow the repressor to bind to the operator. There would be transcription of the trp operon when the cell is in a. a low tryptophan environment b. a high tryptophan environment c. both d. neither (Do not consider the effect of attenuation when answering this question). 9. A bacterium has one wild-type copy of the trp operon and a mutation in the trpR gene that doesn't allow the repressor to bind to tryptophan. There would be transcription of the trp operon when the cell is in a. a low tryptophan environment. b. a high tryptophan environment c. both d. neither (Do not consider the effect of attenuation when answering this question). 10. Attenuation of the trp operon a. shuts off all transcription when tryptophan levels are high b. shuts off leaky transcription when tryptophan levels are high c. shuts off all transcription when tryptophan levels are low d. shuts off leaky transcription when tryptophan levels are low