metabolism

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• Enzymes
  Biological catalysts that accelerate biochemical reactions by lowering activation energy, without being consumed in the process.
• Cellular Respiration
  The metabolic process by which cells harvest energy from glucose as ATP through glycolysis, the citric acid cycle, and oxidative phosphorylation.
• Citric Acid Cycle
  The central metabolic cycle that oxidizes acetyl-CoA into carbon dioxide, harvesting electrons and energy for aerobic organisms.