The correct sequence of steps as energy is extracted from glucose during cellular respiration is glycolysis → acetyl coa citric acid cycle → electron transport chain.
What are the steps as energy is extracted from glucose during cellular respiration?
- Cellular respiration is a metabolic pathway that breaks down glucose and produces ATP.
- The stages of cellular respiration include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation.
- In glycolysis, glucose—a six-carbon sugar—undergoes a series of chemical transformations. In the end, it gets converted into two molecules of pyruvate, a three-carbon organic molecule.
- Pyruvate oxidation- Each pyruvate from glycolysis goes into the mitochondrial matrix—the innermost compartment of mitochondria.
- The citric acid or Krebs cycle- The acetyl CoA made in the last step combines with a four-carbon molecule and goes through a cycle of reactions, ultimately regenerating the four-carbon starting molecule.
- Oxidative phosphorylation- As electrons move down the chain, energy is released and used to pump protons out of the matrix, forming a gradient. Protons flow back into the matrix through an enzyme called ATP synthase, making ATP. At the end of the electron transport chain, oxygen accepts electrons and takes up protons to form water.
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