AP_Bio_ch_18-20_take_home_final

AP_Bio_ch_18-20_take_home_final - AP Biology Chapter 18-20...

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AP Biology Chapter 18-20 Questions Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. What does the operon model attempt to explain? a. the coordinated control of gene expression in bacteria b. bacterial resistance to antibiotics c. how genes move between homologous regions of DNA d. the mechanism of viral attachment to a host cell e. horizontal transmission of plant viruses ____ 2. The tryptophan operon is a repressible operon that is a. permanently turned on. b. turned on only when tryptophan is present in the growth medium. c. turned off only when glucose is present in the growth medium. d. turned on only when glucose is present in the growth medium. e. turned off whenever tryptophan is added to the growth medium. ____ 3. This protein is produced by a regulatory gene: a. operon b. inducer c. promoter d. repressor e. corepressor ____ 4. When this is taken up by the cell, it binds to the repressor so that the repressor no longer binds to the operator: a. operon b . inducer c. promoter d . repressor e. corepressor ____ 5. A mutation that inactivates the regulatory gene of a repressible operon in an E. coli cell would result in a. continuous transcription of the structural gene controlled by that regulator. b. complete inhibition of transcription of the structural gene controlled by that regulator. c. irreversible binding of the repressor to the operator. d. inactivation of RNA polymerase by alteration of its active site. e. continuous translation of the mRNA because of alteration of its structure. ____ 6. The lactose operon is likely to be transcribed when a. there is more glucose in the cell than lactose. b. the cyclic AMP levels are low. c. there is glucose but no lactose in the cell. d. the cyclic AMP and lactose levels are both high within the cell. e. the cAMP level is high and the lactose level is low.
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____ 7. How does active CAP induce expression of the genes of the lactose operon? a. It terminates production of repressor molecules. b. It degrades the substrate allolactose. c. It stimulates splicing of the encoded genes. d. It stimulates the binding of RNA polymerase to the promoter. e. It binds steroid hormones and controls translation. Use the following scenario to answer the following questions. Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome. ____ 8. If she moves the promoter for the lac operon to the region between the beta galactosidase gene and the permease gene, which of the following would be likely? a. Three structural genes will no longer be expressed. b. RNA polymerase will no longer transcribe permease. c. The operon will no longer be inducible.
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This note was uploaded on 02/28/2010 for the course BIOMIC Bio765 taught by Professor Sangte during the Spring '10 term at Eastern Oregon.

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AP_Bio_ch_18-20_take_home_final - AP Biology Chapter 18-20...

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