Question:
The protons released during the oxidation of NADH+H\({}^{+}\) and FADH\({}_{2}\) in mitochondria follow the paths given below EXCEPT:
The protons released during the oxidation of NADH+H\({}^{+}\) and FADH\({}_{2}\) in mitochondria follow the paths given below EXCEPT:
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Follow the protons from the intermembrane space through the F0 channel to the formation of water in the matrix. Decide which statement does not belong to this path.
Updated On: Nov 12, 2026
- Protons are released into intermembrane space.
- They are channelized into the inner chamber by \(\text{F}_{0}\) part of oxysome present in the inner membrane.
- These protons react with reduced molecular oxygen to form water molecule.
- This water molecule evaporates through the stomata.
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
During oxidation of NADH and FADH2, electrons pass along the electron transport chain and protons are pumped out of the matrix into the intermembrane space.
The proton gradient then drives protons back into the matrix.
Step 2: Trace the proton path
Protons first collect in the intermembrane space. They return to the inner chamber (matrix) through the \(\text{F}_{0}\) channel of the oxysome. In the matrix they join oxygen that has accepted electrons, forming water.
Step 3: Check the last statement
The water formed in the matrix is metabolic water. It joins the water pool of the cell and is not released through stomata.
Step 4: Conclusion
Statements 1, 2 and 3 describe the real path of protons. Only the statement about evaporation through stomata is not part of it.
Final Answer:
The statement that the water formed evaporates through the stomata is not part of the proton path. \[ \boxed{\text{(D) }\text{This water molecule evaporates through the stomata.}} \]
During oxidation of NADH and FADH2, electrons pass along the electron transport chain and protons are pumped out of the matrix into the intermembrane space.
The proton gradient then drives protons back into the matrix.
Step 2: Trace the proton path
Protons first collect in the intermembrane space. They return to the inner chamber (matrix) through the \(\text{F}_{0}\) channel of the oxysome. In the matrix they join oxygen that has accepted electrons, forming water.
Step 3: Check the last statement
The water formed in the matrix is metabolic water. It joins the water pool of the cell and is not released through stomata.
Step 4: Conclusion
Statements 1, 2 and 3 describe the real path of protons. Only the statement about evaporation through stomata is not part of it.
Final Answer:
The statement that the water formed evaporates through the stomata is not part of the proton path. \[ \boxed{\text{(D) }\text{This water molecule evaporates through the stomata.}} \]
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