Bacteroids Must Be Able to Respire to Reduce N₂ Gas

question 89

Multiple Choice

Bacteroids must be able to respire to reduce N₂ gas.Yet, nitrogenase is inhibited by O₂.How is this conflict resolved in a nodule?

• A) Nitrogenase in a nodule is not inhibited by oxygen.
• B) The bacteroid secretes a protein that binds oxygen.
• C) The plant expresses a protein that acts as an oxygen buffer in nodules.
• D) The concentration of O₂ needed for respiration by bacteroids is lower than that required to inactivate nitrogenase.
• E) The plant expresses a protein that acts as an oxygen buffer in nodules and the concentration of O₂ needed for respiration by bacteroids is lower than that required to inactivate nitrogenase.

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