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Questions and Answers
What is the primary purpose of cellular respiration?
In which organelle does cellular energy production primarily take place in eukaryotic cells?
What is the final step of cellular respiration that releases energy from food molecules?
Which process occurs in the mitochondria and is responsible for producing energy in the form of ATP?
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In which stage of aerobic respiration does the breakdown of a glucose molecule into two pyruvate molecules occur?
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Which type of cellular respiration requires oxygen as the final electron acceptor?
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What is the function of the electron transport chain in cellular respiration?
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Which molecule acts as the final electron acceptor in aerobic cellular respiration?
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What is the primary purpose of the Krebs cycle in cellular respiration?
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Why is cellular respiration important for living organisms?
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Study Notes
- Cellular respiration is a process that occurs in the mitochondria of eukaryotic organisms for producing energy in the form of ATP.
- There are two types of cellular respiration: aerobic and anaerobic. Aerobic respiration requires oxygen, while anaerobic respiration does not.
- Aerobic respiration consists of three main stages: glycolysis, the Krebs cycle (citric acid cycle), and oxidative phosphorylation.
- Glycolysis is the first stage of aerobic respiration, which occurs in the cytoplasm, and involves the breakdown of a glucose molecule into two pyruvate molecules, producing a net gain of 2 ATP molecules.
- In the transition reaction, the pyruvate molecules enter the mitochondria and are broken down to form acetyl-CoA, releasing carbon dioxide and generating NADH.
- The Krebs cycle, the second stage of aerobic respiration, occurs in the mitochondria and produces 8 NADH, 2 FADH2, 6 carbon dioxide, and 2 ATP.
- Oxidative phosphorylation is the final stage of aerobic respiration, which occurs in the mitochondria, and uses the NADH and FADH2 generated in the previous stages to produce a large number of ATP molecules. It requires oxygen as the final electron acceptor.
- Fermentation is an anaerobic process that follows glycolysis, and it yields small amounts of ATP and different byproducts depending on the type of cell.
- Anaerobic cellular respiration is another anaerobic process, which also occurs in the mitochondria, and uses a molecule other than oxygen as the final electron acceptor in the electron transport chain.
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Description
Test your knowledge about the metabolic process by which living cells acquire chemical energy from food. Explore the series of biochemical reactions involved in breaking down food molecules to create energy within a cell.
