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Which of the following statements about nitrogenase enzymes is accurate?

1. These enzymes enable certain organisms to convert atmospheric nitrogen into a usable form.
2. They are the sole group of enzymes known to perform this function.
3. Nitrogenase activity demands significant energy input and operates under oxygen-free conditions.
4. All of the above statements are true.

Correct answer: All of the above statements are true.

Solution

All the given statements about nitrogenase are correct: it fixes atmospheric nitrogen, is the only enzyme family known to do so, and requires high energy and anaerobic conditions for its activity.

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