Question:
How many electrons and ATP are required for the biological fixation of a molecule of nitrogen to form ammonia?
How many electrons and ATP are required for the biological fixation of a molecule of nitrogen to form ammonia?
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Recall the overall nitrogenase equation for converting N2 to NH3.
Updated On: Nov 12, 2026
- 4 and 8 respectively
- 2 and 4 respectively
- 8 and 16 respectively
- 16 and 32 respectively
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Nitrogenase reduces \(\text{N}_{2}\) to \(\text{NH}_{3}\) using electrons and ATP.
Step 2: Equation
\(\text{N}_{2}+8\text{e}^{-}+8\text{H}^{+}+16\,\text{ATP}\rightarrow2\text{NH}_{3}+\text{H}_{2}+16\,\text{ADP}+16\,\text{P}_{i}\).
Step 3: Result
Eight electrons and 16 ATP are used per molecule of nitrogen fixed.
Final Answer:
8 electrons and 16 ATP are required. \[ \boxed{\text{(C) }8\text{ and }16\text{ respectively}} \]
Nitrogenase reduces \(\text{N}_{2}\) to \(\text{NH}_{3}\) using electrons and ATP.
Step 2: Equation
\(\text{N}_{2}+8\text{e}^{-}+8\text{H}^{+}+16\,\text{ATP}\rightarrow2\text{NH}_{3}+\text{H}_{2}+16\,\text{ADP}+16\,\text{P}_{i}\).
Step 3: Result
Eight electrons and 16 ATP are used per molecule of nitrogen fixed.
Final Answer:
8 electrons and 16 ATP are required. \[ \boxed{\text{(C) }8\text{ and }16\text{ respectively}} \]
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