Biology 1201 Final Exam LSU Questions and Answers Gregg

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Biology 1201 Final Exam LSU Questions and Answers Gregg

1. by regulating transcription: How do bacteria often respond to environmental change? 2. by feedback inhibition or by gene regulation: How can a cell regulate the production of enzymes? 3. operator: A cluster of functionally related genes can be coordinately controlled by a single "on-off switch" called an 4. operon: A is the entire stretch of DNA that includes the operator, the promoter, and the genes that they control 5. repressor: The operon can be switched off by a protein 6. corepressor: A is a molecule that cooperates with a repressor protein to switch an operon off 7. repressible operon and inducible operon: What are 2 types of negative gene regulation? 8. repressible operon: A is one that is usually on; binding of a repressor to the operator shuts off transcription (The trp operon is a repressible operon) 9. inducible operon: A is one that is usually off; a molecule called an inducer inactivates the repressor and turns on transcription (ex: lac operon [breaks down lactose]) 10. inducer: A molecule called an inactivates the repressor to turn the lac operon on 11. inducible enzymes: usually function in catabolic pathways; their synthesis is induced by a chemical signal 12. repressible enzymes: usually function in anabolic pathways; their synthesis is repressed by high levels of the end product

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