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6 Cards in this Set
- Front
- Back
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When do bacteria normally regulate gene expression?
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Bacteria usually regulate gene expression during transcription.
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How is the lac operon induced?
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Lactose combines with the lac repressor to inactivate it. RNA polymerase can then bind to the promoter and transcribe the lac operon.
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How is the trytophan operon repressed?
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Trytophan binds to the trp operon aporepressor to form an active complex, which binds to the trp operator and prevents RNA polmerase binding and transcription
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Describe feedback inhibition.
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Feedback inhibition is associated with repressible operons where the end product of the operon pathway makes a complex with the aporepressor to inhibit transcription.
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Give two ways that inducible and repressible expression control differs.
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Inducible systems turn on expression while repressible systems turn them off. Repressible systems have fine control over how much expression occurs.
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What is the function of proteases?
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Proteases rid the cell of unwanted proteins.
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