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During aerobic cellular respiration, most of the energy that allows a cell to produce ATP is derived from which specific process?Multiple choice question.Electrons passing between carrier proteins of the electron transport chainThe biochemical reactions of glycolysisThe biochemical reactions of the citric acid cycleSplitting oxygen atoms to produce high-energy electrons

Question

During aerobic cellular respiration, most of the energy that allows a cell to produce ATP is derived from which specific process?Multiple choice question.Electrons passing between carrier proteins of the electron transport chainThe biochemical reactions of glycolysisThe biochemical reactions of the citric acid cycleSplitting oxygen atoms to produce high-energy electrons

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Solution

The answer is: Electrons passing between carrier proteins of the electron transport chain.

Here's why:

Aerobic cellular respiration is a process that cells use to transfer energy from the organic molecules in food to ATP (Adenosine Triphosphate), the main energy currency of cells. This process involves three main stages: Glycolysis, the Citric Acid Cycle (also known as the Krebs Cycle), and the Electron Transport Chain.

  1. Glycolysis: This is the first step in cellular respiration. It occurs in the cytoplasm and breaks down glucose into two molecules of pyruvate, producing a small amount of ATP and NADH in the process. However, it does not produce the majority of a cell's ATP.

  2. The Citric Acid Cycle: This occurs in the mitochondria and further breaks down the pyruvate molecules from glycolysis, producing a small amount of ATP, NADH, and FADH2. While this step does produce some ATP, it is not the main source of ATP in cellular respiration.

  3. The Electron Transport Chain: This is the final stage of aerobic respiration and it occurs in the inner mitochondrial membrane. Here, the NADH and FADH2 molecules produced in the previous steps are used to power the transport of electrons through a series of carrier proteins. As the electrons are passed along the chain, they release energy which is used to pump protons across the membrane, creating a gradient. This gradient is then used to power ATP synthase, an enzyme that produces ATP. This process, known as oxidative phosphorylation, produces the majority of the ATP in cellular respiration.

Therefore, most of the energy that allows a cell to produce ATP during aerobic cellular respiration is derived from the process of electrons passing between carrier proteins of the electron transport chain.

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