The Enzyme Nitrogenase Is Inhibited by Oxygen

question 29

Multiple Choice

The enzyme nitrogenase is inhibited by oxygen. In cyanobacteria, nitrogenase activity is protected by the following mechanism:

• A) special, thick-walled cells (heterocysts) in filamentous cyanobacteria, such as Anabaena
• B) special nitrogenase-protecting proteins in Azotobacter species
• C) spatial separation of nitrogen fixation (at night) and photosynthesis (during the day)
• D) all of the above
• E) none of the above

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