The Enzyme Nitrogenase Is Inhibited by Oxygen

question 35

Multiple Choice

The enzyme nitrogenase is inhibited by oxygen. Which of the following does NOT protect nitrogenase from oxygen?

• A) special thick-walled cells (heterocysts) in filamentous cyanobacteria, such as Anabaena
• B) special nitrogenase-protecting proteins in Azotobacter species
• C) temporal separation of nitrogen fixation (at night) and photosynthesis (during the day) in some species of cyanobacteria
• D) growth under aerobic conditions
• E) growth under anaerobic conditions

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