Question:
The ultimate electron acceptor in ETS in aerobic respiration is ___________ and it reacts with protons to form ________.
The ultimate electron acceptor in ETS in aerobic respiration is ___________ and it reacts with protons to form ________.
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Cytochrome oxidase passes electrons to oxygen, which forms water with protons.
Updated On: Nov 12, 2026
- Cytochrome a, water
- Molecular oxygen, metabolic water
- Glucose, Carbon di-oxide
- Hydrogen, acetaldehyde
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
In the electron transport chain, electrons pass from NADH and \(\text{FADH}_2\) through ubiquinone and the cytochromes to cytochrome oxidase.
Step 2: Final acceptor
Cytochrome oxidase hands them to molecular oxygen, the final acceptor, which is why aerobic respiration stops without \(\text{O}_2\).
Step 3: Product
Reduced oxygen combines with protons to form water, called metabolic water.
Final Answer:
Molecular oxygen is the ultimate acceptor and it forms metabolic water. \[ \boxed{\text{(B) }\text{Molecular oxygen, metabolic water}} \]
In the electron transport chain, electrons pass from NADH and \(\text{FADH}_2\) through ubiquinone and the cytochromes to cytochrome oxidase.
Step 2: Final acceptor
Cytochrome oxidase hands them to molecular oxygen, the final acceptor, which is why aerobic respiration stops without \(\text{O}_2\).
Step 3: Product
Reduced oxygen combines with protons to form water, called metabolic water.
Final Answer:
Molecular oxygen is the ultimate acceptor and it forms metabolic water. \[ \boxed{\text{(B) }\text{Molecular oxygen, metabolic water}} \]
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