2952131774-quiz_2a_key

2952131774-quiz_2a_key - Mic102/Win08/Appleman Quiz 2 13...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Mic102/Win08/Appleman Quiz 2, 13 February 2008 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. Deep sea hydrothermal vents are amazing places. Discovered in the 1970’s, these are areas where the plates that make up the earth’s crust are moving apart, and ocean water percolating through the sea floor can be exposed to the hot rocks of the earth’s interior. The water comes back, rushing out of these vents at very high temperatures and saturated with reduced minerals. These vents support ecosystems that have some fascinating inhabitants; the ecosystems are remarkable in that they are completely independent of the sun. Nonetheless, they are some of the most productive ecosystems in the world, converting matter and energy into living material at a faster rate than a well-tended corn farm!
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
We’ve already met one of the organisms that lives in these geothermal vents—the hyperthermophilic Archaean “strain 121”. It was grown in the laboratory in minimal medium under anaerobic conditions. The medium contained formate (HCOO-) as the only source of carbon, Fe +3 oxide, and ammonia. As the organism grew, it produced magnetite (Fe +2 oxide; in the figure, tube A1 contains the organism, while tube A2 does not). 1. Which of these happens when strain 121 generates energy? a) electrons go from formate to ammonia b) electrons go from ammonia to formate c) electrons go from formate to Fe +3 --Iron is getting reduced, and something else must be getting oxidized—formate. d) formate is fermented anaerobically 2. Strain 121 is an autotroph. How could the researchers determine this? a) it has the gene for Rubisco— not likely, given that it’s Archaea b) it grows in the absence of fixed carbon—this is by definition. c) it has genes for the oxidative Krebs cycle— there are other options d) it has nitrogenase 3. Autotrophy requires high energy electrons. How does strain 121 get high energy e-? a) energizing e- from formate by reversing the flow of e- through an electron transport chain b) photosystem I c) electrons from formate are at very high energy already, and can reduce ferredoxin—see table of reduction potentials. d) electrons are moved through ATPase
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern