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Understanding Aerobic Respiration: Mitochondria, Citric Acid Cycle, and Electron Transport Chain

This guide explores the processes of aerobic respiration, highlighting where the reactions occur in the mitochondria. After glycolysis, the Citric Acid Cycle takes place in the matrix, followed by the Electron Transport Chain in the inner cristae. The Citric Acid Cycle produces energy-carrying molecules like NADH and ATP through various steps, beginning with Acetyl-CoA. The Electron Transport Chain uses NADH and FADH2 to create ATP via chemiosmosis, contributing to a total of 36 ATP from glycolysis and aerobic reactions.

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Understanding Aerobic Respiration: Mitochondria, Citric Acid Cycle, and Electron Transport Chain

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  1. Cellular Respiration Aerobic Respiration

  2. Target #23- I can identify where the aerobic reactions of cellular respiration occur • After glycolysis, if oxygen is present, the Citric Acid Cycle and an Electron Transport Chain occurs • Occurs within the mitochondria • Citric Acid Cycle occurs in the matrix • The Electron Transport Chain occurs in the cristae, or the inner folds

  3. Target #24- I can describe the steps of the Citric Acid cycle • Citric Acid Cycle: produces molecules that carry energy to the second part of cellular respiration (2 cycles per 1 glucose) • Step 1: the pyruvate from glycolysis is broken down with enzyme CoA • Creates Acetyl Co-A, and2 CO2 • Step 2: Acetyl Co-A combines with a 4-carbon molecule to make citric acid • 2 ATP is made, 2 CO2is released • Step 3: energy released is used to make several energy carrying molecules • 6 NADH and 2FADH2

  4. Target #25- I can describe the steps of the cellular respiration electron transport chain • Electron Transport Chain • Step 4: NADH and FADH2 transferred to an electron transport chain in the inner membrane of the mitochondria

  5. Step 5: Electrons are released and travel through transport proteins called cytochrome molecules • Releases H+ ions into the cristae • H+ in the matrix and free floating O2 combine to form water molecules • Step 6: H+ ions in the cristae are pumped through to the matrix by an ATP synthase protein • Turns ADP into ATP • Known as chemiosmosis Target #25- cont

  6. Target #26- I can state how many total ATP are made during glycolysis and the aerobic reactions of cellular respiration • Total ATP made during glycolysis and the aerobic reactions of cellular respiration = 36

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