Calvin-Benson-Bassham (CBB) Cycle
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Questions and Answers

What is the key enzyme involved in carbon fixation?

  • Ribulose bisphosphate carboxylase/oxygenase (RuBisCO) (correct)
  • ATP synthase
  • DNA polymerase
  • RNA polymerase
  • In what type of environments are methanogens commonly found?

  • Marine environments
  • Anaerobic environments (correct)
  • Forest ecosystems
  • Aerobic environments
  • What is the process of reducing N2 into NH3 known as?

  • Photosynthesis
  • Cellular respiration
  • Methanogenesis
  • Diazotrophy (correct)
  • Which pathway is not used by methanogens for methane production?

    <p>Embden-Meyerhof pathway</p> Signup and view all the answers

    What percentage of naturally occurring nitrogen fixation happens abiotically?

    <p>~5-8%</p> Signup and view all the answers

    Where do methanogens carry out methanogenesis most efficiently?

    <p>Oxygen-deprived conditions</p> Signup and view all the answers

    What is the primary role of nitrifying bacteria in ecosystems?

    <p>Converting ammonia to nitrite and then to nitrate</p> Signup and view all the answers

    Which electron donor is used by sulfate-reducing bacteria in their metabolic processes?

    <p>Sulfur compounds</p> Signup and view all the answers

    In which type of environment are sulfate-oxidizing bacteria commonly found?

    <p>Oxygen-rich environments</p> Signup and view all the answers

    What is the main contribution of chemotrophy to ecosystems?

    <p>Energy production without producing oxygen</p> Signup and view all the answers

    Which chemical compound serves as an electron donor for nitrifying bacteria during the nitrification process?

    <p>Ammonia</p> Signup and view all the answers

    Where are chemotrophic organisms commonly found due to their adaptation to specific electron donors?

    <p>Environments where organic carbon sources are limited</p> Signup and view all the answers

    What is the role of RuBisCO in the Calvin-Benson-Bassham cycle?

    <p>Catalyzing the carboxylation of ribulose-1,5-bisphosphate</p> Signup and view all the answers

    In the Calvin-Benson-Bassham cycle, what is the significance of carbon fixation?

    <p>Conversion of carbon dioxide into organic compounds</p> Signup and view all the answers

    Why do some organisms have CO2 Concentrating Mechanisms (CCMs)?

    <p>To enhance the efficiency of carbon fixation by concentrating CO2 around RuBisCO</p> Signup and view all the answers

    Which component is involved in CO2 Concentrating Mechanisms (CCMs) to facilitate the accumulation and delivery of CO2 to RuBisCO?

    <p>Carbonic anhydrase enzymes</p> Signup and view all the answers

    What is the ultimate product generated by the Calvin-Benson-Bassham (CBB) cycle?

    <p>Glyceraldehyde-3-phosphate (G3P)</p> Signup and view all the answers

    Why have organisms with Carbon Concentrating Mechanisms (CCMs) evolved these mechanisms?

    <p>To thrive in environments with low CO2 availability or optimize photosynthetic efficiency</p> Signup and view all the answers

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