Among the Mechanisms to Avoid Nitrogenase Inhibition by Oxygen, Cyanobacteria

question 43

Multiple Choice

Among the mechanisms to avoid nitrogenase inhibition by oxygen, cyanobacteria:

• A) produce organic acids; aerobic heterotrophs consume available oxygen
• B) develop heterocysts, thick-walled cells specialized in fixing nitrogen
• C) perform photosynthesis by day and nitrogen fixation at night
• D) form cell aggregates, favoring nitrogen fixation in the anaerobic interior
• E) all of the above

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