Which of the following events takes place in the electron transport chain? a) The breakdown of glucose into six carbon dioxide molecules. b) The breakdown of NADH and FADH 2 to carbon dioxide. c) Harnessing energy from high-energy electrons derived from glycolysis, pyruvate oxidation, and the Krebs cycle. d) Substrate-level phosphorylation.

Okay, everyone. Which of the following events takes place in the electron transport chain? Okay. So, the electron transport chain is one of the last steps of aerobic cellular respiration, glycolysis, pyruvate oxidation, and Krebs cycle have already happened. So, let's have a look at our answer choices. Okay. Which of these happens in the electron transport chain? The breakdown of glucose into 6 carbon dioxide molecules. Remember that this is going to happen throughout the process of the first through third steps, glycolysis, pyruvate oxidation, and Krebs cycle. It doesn't happen in the electron transport chain. Answer choice b says the breakdown of NADH and FADH 2 to carbon dioxide. This doesn't happen. Remember that these are electron carriers. They're not going to break down into carbon dioxide. This is not what we're looking for. Answers with C says harnessing energy from high energy electrons derived from glycolysis pyruvate oxidation and the Krebs cycle. This is a really good answer because glycolysis, pyruvate oxidation, and the krebs cycle all make electron carriers, which hold high energy electrons, which are then used by the electron transport chain. So this is a great answer. Let's rule out answer choice d. Answer choice d simply states substrate level phosphorylation. Excuse me. Remember that this is going to happen in glycolysis and the Krebs cycle, not in the electron transport chain. So the correct answer here is answer choice c. Okay, everyone. Let's move on to our next video.

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12. Microbial Metabolism

Electron Transport Chain

Microbiology

12. Microbial Metabolism

Electron Transport Chain

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Multiple Choice

Which of the following events takes place in the electron transport chain?
a) The breakdown of glucose into six carbon dioxide molecules.
b) The breakdown of NADH and FADH₂ to carbon dioxide.
c) Harnessing energy from high-energy electrons derived from glycolysis, pyruvate oxidation, and the Krebs cycle.
d) Substrate-level phosphorylation.

The breakdown of glucose into six carbon dioxide molecules.

The breakdown of NADH and FADH2 to carbon dioxide.

Harnessing energy from high-energy electrons derived from glycolysis, pyruvate oxidation, and the Krebs cycle.

Substrate-level phosphorylation.

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Verified step by step guidance

Understand the role of the electron transport chain (ETC) in cellular respiration. The ETC is the final stage of aerobic respiration, occurring in the inner mitochondrial membrane, where it facilitates the transfer of electrons from electron donors to electron acceptors via redox reactions.

Recognize that the primary function of the ETC is to harness energy from high-energy electrons. These electrons are derived from NADH and FADH2, which are produced during glycolysis, pyruvate oxidation, and the Krebs cycle.

Identify that as electrons pass through the ETC, they move through a series of protein complexes and coenzymes. This movement releases energy, which is used to pump protons (H+) across the mitochondrial membrane, creating a proton gradient.

Understand that the energy stored in the proton gradient is used by ATP synthase to synthesize ATP from ADP and inorganic phosphate. This process is known as oxidative phosphorylation, which is distinct from substrate-level phosphorylation that occurs in glycolysis and the Krebs cycle.

Conclude that the correct event taking place in the electron transport chain is the harnessing of energy from high-energy electrons derived from glycolysis, pyruvate oxidation, and the Krebs cycle, as this is the primary function of the ETC in cellular respiration.