268360373-old_quiz_2_key

268360373-old_quiz_2_key - Mic102/Fa07/Appleman Quiz 2, 31...

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1 Mic102/Fa07/Appleman Quiz 2, 31 October 2007 This quiz is to represent only your own work . As a UC Davis student, you are bound by an honor code; if you can’t be trusted with that, can you be trusted in a career in, say, the health professions? This quiz is closed book, closed note. Please hand in a blue scantron with the answers to the multiple choice section of the quiz. Make sure that it has your name, student I.D.#, and “ Test form A ” filled in. You will also need to hand in the last two pages of this quiz, with your name on each. Searles lake, in central California, is a miserable place. In the middle of a desert, it is a basin that receives water from the surrounding area, but has no outlet. Summer temperatures average well over 40 ° C. Most of the water evaporates in the desert heat, leaving behind all the salts that it carried. The surrounding area has lots of mines, so the water flowing into the lake has lots of metals in it. The result is a shallow, very still lake, saturated with 5 M NaCl, lots of arsenic and other heavy metals, phosphate, sulfate, and other salts. It is also home to a surprisingly wide variety of microbes. To us, it seems mighty close to hell, but it’s a thriving microbial metropolis.
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2 1. One of the critical inhabitants of the hypersaline environment is Dunaliella , an organism that has both photosystem I and photosystem II. What describes the ecological role of Dunaliella ? a) photoheterotroph— no, organisms have PSII so they can be autotrophic b) primary producer c) psychrophile— it’s hot at Searles Lake d) obligate anaerobe— PSII makes O2 2.The biological role of photosystem II in Dunaliella is a) generate ATP by cyclic photophosphorylation-- PSI b) take electrons from water and donate them to photosystem I c) to serve as an antenna complex for photosystem I— sends e-, not energy d) to produce NAD(P)H-- PSI 3. Dunaliella uses a variety of chlorophyll in its energy-generating process; this chlorophyll appears green in color. However, living Dunaliella cells are red. Why? a) The chlorophyll is inactivated in salty environments b) the chlorophyll is bleached by the intense sunlight— carotenoids protect chl. c) Dunaliella makes lots of carotenoids in addition to chlorophyll d) the cell wall is red 4. Dunaliella uses the Calvin cycle to fix carbon. What is the role of Rubisco in the Calvin cycle? a) carboxylation of a pentose— Rubisco = Ribulose bisphosphate CARBOXYLASE b) isomerization of a pentose c) rearrangement of carbons in three- and seven- carbon sugars d) generation of ATP
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3 5. The organisms growing anaerobically in the mud of Searles lake were cultured in the laboratory, and given the name SLAS-1. The growth medium contained lactate (CH
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268360373-old_quiz_2_key - Mic102/Fa07/Appleman Quiz 2, 31...

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