16. Regulation of Expression
The Lac Operon
16. Regulation of Expression
The Lac Operon
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- Multiple Choice
The protein that binds to the operator of the lac operon to prevent transcription is encoded by which gene?
- Multiple Choice
The lac operon is a(n) _______________ operon that is typically ______________.
- Multiple Choice
In the lac operon, which of the following functions does the lactose molecule serve:
- Multiple Choice
If E. coli bacteria are grown in the presence of lactose:
- Open QuestionWhy are the genes involved in lactose metabolism considered to be an operon?a. They occupy adjacent locations on the E. coli chromosome.b. They have a similar function.c. They are all required for normal cell function.d. They are all controlled by the same promoter.
- Open QuestionWhy are the genes involved in lactose metabolism considered to be an operon?a. They occupy adjacent locations on the E. coli chromosome.b. They have a similar function.c. They are all required for normal cell function.d. They are all controlled by the same promoter.
- Open QuestionEvaluate these statements about regulation of the lac operon. Select True or False for each statement.T/FThe lac operon is transcribed at the highest rate when extracellular glucose and lactose are abundant.T/FThe repressor protein is bound to DNA of the operator when lactose is present.T/FA mutation in the operator is likely to prevent transcription of the lac operon under any condition.T/FA mutation that alters the catabolite activator protein is predicted to alter the regulation of many different operons.
- Open QuestionEvaluate these statements about regulation of the lac operon. Select True or False for each statement.T/FThe lac operon is transcribed at the highest rate when extracellular glucose and lactose are abundant.T/FThe repressor protein is bound to DNA of the operator when lactose is present.T/FA mutation in the operator is likely to prevent transcription of the lac operon under any condition.T/FA mutation that alters the catabolite activator protein is predicted to alter the regulation of many different operons.