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Which stage(s) of cellular respiration produces both NADH and FADH₂?Group of answer choicesglycolysispyruvate oxidationoxidative phosphorylationcitric acid cycle

Question

Which stage(s) of cellular respiration produces both NADH and FADH₂?Group of answer choicesglycolysispyruvate oxidationoxidative phosphorylationcitric acid cycle

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Solution

The stages of cellular respiration that produce both NADH and FADH₂ are pyruvate oxidation and the citric acid cycle.

Here's a step-by-step breakdown:

  1. Glycolysis: This is the first stage of cellular respiration. It occurs in the cytoplasm and does not require oxygen. In this stage, glucose is broken down into two molecules of pyruvate. This process produces 2 NADH molecules, but no FADH₂.

  2. Pyruvate Oxidation: This stage occurs in the mitochondria. Each pyruvate is converted into Acetyl CoA, and in the process, one molecule of NADH is produced per pyruvate, but no FADH₂.

  3. Citric Acid Cycle (also known as the Krebs Cycle): This stage also occurs in the mitochondria. For each Acetyl CoA that enters the cycle, 3 NADH and 1 FADH₂ are produced.

  4. Oxidative Phosphorylation: This is the final stage of cellular respiration. It occurs in the inner mitochondrial membrane. While this stage uses NADH and FADH₂ to produce ATP, it does not produce any NADH or FADH₂ itself.

So, to answer your question, both NADH and FADH₂ are produced in

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