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Which is true about how are cells use oxygen? A. When oxygen is present pyruvate is...

Which is true about how are cells use oxygen?

A. When oxygen is present pyruvate is converted to lactate which enters the citric acid cycle. The reduced coenzymes donate hydrogen ions and high energy electrons to the electron transport chain, and oxygen acts as the final acceptor of hydrogen ions and low energy electrons after the hydrogen ions have passed through ATP synthase.

B. When oxygen is present pyruvate is converted to Acetyl CoA which enters the citric acid cycle. The reduced coenzymes donate hydrogen ions and high energy electrons to the electron transport chain, and oxygen acts as the final acceptor of hydrogen ions and low energy electrons after the hydrogen ions have passed through ATP synthase.

C. When oxygen is present pyruvate is converted to Acetyl CoA which enters glycolysis. The reduced coenzymes donate hydrogen ions and high energy electrons to the electron transport chain, and oxygen acts as the final acceptor of hydrogen ions and low energy electrons after the hydrogen ions have passed through ATP synthase.

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Answer #1

ANSWER :

In the presence of oxygen, the pyruvate formed during the glycolysis is converted to acetyl-CoA, which enters the citric acid cycle. The reduced coenzymes (NADH & FADH2) donate hydrogen ions and high energy electrons to the electron transport chain (ETC), and oxygen molecules act as the final acceptor of hydrogen ions and low energy electrons after the hydrogen ions have passed through ATP synthase. Hence option (B) is the correct answer choice.

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