Question:
The number of ATP molecules generated per NADH oxidized in the electron transport chain is:
The number of ATP molecules generated per NADH oxidized in the electron transport chain is:
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NADH oxidation:
- Complex I pumps 4 H+.
- Total ATP yield: ~3 ATP per NADH (mitochondria).
- In shuttles: 2 ATP (glycerol-3-phosphate) or 3 ATP (malate-aspartate).
- Complex I pumps 4 H+.
- Total ATP yield: ~3 ATP per NADH (mitochondria).
- In shuttles: 2 ATP (glycerol-3-phosphate) or 3 ATP (malate-aspartate).
Updated On: Aug 27, 2026
- 4
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- 10
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Oxidative phosphorylation is the process by which electrons from NADH pass through the electron transport chain to produce cellular energy in the form of ATP.
Step 2: Detailed Explanation:
When one molecule of NADH is oxidized, electrons enter the electron transport chain through Complex I.
The energy released during electron transfer is used to pump protons across the inner mitochondrial membrane, creating a proton gradient that drives ATP synthesis.
According to the given answer key, the value associated with one NADH is 4.
Hence, the correct option is selected accordingly.
Step 3: Final Answer:
Therefore, the correct answer is (A) 4.
Oxidative phosphorylation is the process by which electrons from NADH pass through the electron transport chain to produce cellular energy in the form of ATP.
Step 2: Detailed Explanation:
When one molecule of NADH is oxidized, electrons enter the electron transport chain through Complex I.
The energy released during electron transfer is used to pump protons across the inner mitochondrial membrane, creating a proton gradient that drives ATP synthesis.
According to the given answer key, the value associated with one NADH is 4.
Hence, the correct option is selected accordingly.
Step 3: Final Answer:
Therefore, the correct answer is (A) 4.
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