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Bios%20100%20spring%202009%20%20exam%203 - Bios 100 spring...

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Bios 100 spring 2009 exam #3 For questions 1-5 use the following key: A. E site B. A site C. P site D. Shine-Dalgarno region E. initiation factors 1. The location where mRNA initially binds to the small ribosomal subunit 2. protein that binds the 5’cap of mRNA 3. site from which a tRNA will leave the ribosome after a peptide bond has been formed 4. location where additional tRNAs carrying their amino acids enter the ribosome 5. is also known as the “peptidyl” site 6. Gene expression can be controlled at which of the following levels? 7. Transcriptional control is 8. The lacI gene codes for
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9. When lactose levels are high, A. lactose binds to the lac repressor protein, causing it to become released from DNA and allow the synthesis of B-galactosidase B. it increases levels of cAMP leading to an acceleration of the production of B- galactosidase C. it binds to the operon region of DNA, stimulating the production of galactoside permease D. lactose binds to the lacI gene causing an increase in both B-galactosidase and galactoside permease E. lactose binds to glucose to form more galactose. 10. The region of DNA where the lac repressor protein binds is called the 11. A polycistronic mRNA from a bacterial cell
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