24 Questions
Which type of microorganisms derive their energy from the oxidation of inorganic compounds?
Chemolithotrophs
What is the final electron acceptor in the oxidation reactions of aerobic chemolithotrophs?
Oxygen
Which of the following bacteria oxidize ammonia to nitrite and nitrate?
Nitrifying bacteria
What do iron-oxidizing bacteria oxidize ferrous iron (Fe2+) to?
Ferric iron (Fe3+)
Which type of microorganisms do not use oxygen as the final electron acceptor in their oxidation reactions?
Anaerobic chemolithotrophs
What do methanogens produce from carbon dioxide (CO2) and hydrogen (H2)?
Methane (CH4)
Where are chemolithotrophs found?
Hydrothermal vents, hot springs, and the deep ocean
Which of the following is not an example of aerobic chemolithotrophs?
Methanogens
What are the alternative electron acceptors used by anaerobic chemolithotrophs?
Nitrate, sulfate, or fumarate
What do sulfur-oxidizing bacteria oxidize sulfur to?
Sulfate (SO42-)
Which type of microorganisms use oxygen as the final electron acceptor in their oxidation reactions?
Aerobic chemolithotrophs
What role do chemolithotrophs play in the biogeochemical cycles?
They contribute to the cycling of inorganic compounds such as sulfur, hydrogen, iron, or methane
What is the process by which methane (CH4) is produced from carbon dioxide (CO2) and hydrogen (H2)?
Methanogenesis
Which group of organisms do not produce oxygen as a byproduct of photosynthesis?
Anoxygenic phototrophs
What is the unique photosynthetic apparatus that green bacteria produce?
Bacteriochlorophyll a
What is the process by which hydrogen (H2) is oxidized to water (H2O) with the release of energy?
Hydrogen Oxidation
Which group of organisms are the most common type of photosynthetic organism on Earth?
Cyanobacteria
Which type of bacteria reduce nitrate (NO3-) to nitrogen gas (N2)?
Denitrifiers
What is the process by which hydrogen (H2) is oxidized to water (H2O) with the release of energy?
Hydrogen Oxidation
What is the unique photosynthetic apparatus that purple bacteria produce?
Bacteriochlorophyll b
What is the main byproduct of oxygenic photosynthesis?
Oxygen
Which group of organisms use light energy to convert inorganic carbon (CO2) into organic compounds?
Phototrophic microorganisms
What is the process by which sulfate (SO42-) is reduced to sulfide (S2-)?
Sulfate-reducing bacteria
What is the process by which oxygenic photosynthesis differs from anoxygenic photosynthesis?
Use of water as an electron donor
Test your knowledge of chemolithotrophic and phototrophic metabolism with this quiz. Explore the diverse group of microorganisms that derive their energy from the oxidation of inorganic compounds and their habitats. Gain insight into the processes of aerobic and anaerobic chemolithotrophy.
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