BIOL 121 (2009) Fall Exam 3+ Key

C conjugate a live bacterial strain with the golden

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Unformatted text preview: lac operator site within the lac operon is an example of which of the following? A. cis- acting element B. para- acting element C. trans- acting element D. inter- acting element E. contra- acting element Answer: A (3 pts) 6) Which of the following is a characteristic of microRNAs (miRNAs)? A. MicroRNAs are short RNA molecules. B. MicroRNAs silence the expression of specific mRNAs. C. MicroRNAs are found in plants and animals. D. MicroRNAs are cut by an enzyme called dicer. E. All of the choices are correct. (3 pts) Answer: E 7) You discover a bacteria species in a deep ocean sample that can turn olive oil into pure gold. The bacteria do not replicate well at sea level, and one night all of your "Golden" bacteria die. What can you do to possibly retrieve the gold- making gene from the dead Golden bacteria? A. Transform a live bacterial strain with the Golden bacteria's DNA. B. Transduce a live bacterial strain with the Golden bacteria's DNA. C. Conjugate a live bacterial strain with the Golden bacteria. D. Transduce the Golden bacteria and then infect a live strain of bacteria with the transducing virus. E. There is nothing you can do because the cells are dead. You will have to search the ocean and hope to find the elusive bacteria again. Answer: A (3 pts) 8) All 100 offspring (F1) of an AA female (dominant phenotype) / aa male mating have the recessive phenotype. The offspring of an F1 mating are likely to have a A. 1:1 ratio of dominant to recessive phenotypes. B. 3:1 ratio of dominant to recessive phenotypes. C. 1:2:1 ratio of dominant to recessive phenotypes. D. All dominant phenotypes. E. All recessive phenotypes...
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This note was uploaded on 01/16/2014 for the course BIOL 121 taught by Professor Dustinbrisson during the Fall '11 term at UPenn.

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