Cell Respiration

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Cell Respiration
Chapter 9
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2 Catabolic Pathways

• Cell Respiration
• Called Aerobic Respiration
• Requires Oxygen
• Fermentation
• Called Anaerobic Respiration
• Oxygen NOT needed

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Cellular Respiration
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Cellular Respiration
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Glycolysis

• Splitting of glucose
• Cytosol (cytoplasm)
• 6-Carbon molecule ? 2 (3-Carbon molecules)
• 2 Phases
• Energy Investment (Consumes 2 ATP)
• Energy Payoff (Produces 4 ATP)

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Questions

• What are the 2 catabolic pathways?
• How do they differ?
• What are the 4 parts of cellular respiration?
• Which of the parts produce ATP?
• Which of the parts produce NADH?
• Which part(s) of cellular respiration require
  oxygen?

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Pyruvate Oxidation

• Pyruvate ? Acetyl CoA
• 3-Carbon ? 2 Carbon
• Needs to get into the mitochondrion
• Transport protein
• Produces
• NADH or FADH2
• CO2

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Citric Acid Cycle

• Called Krebs Cycle OR Tricarboxylic Acic Cycle
  (TCA)
• Mitochondria
• Produces
• CO2
• NADH
• FADH2
• ATP (Actually GTP ? ATP)

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Questions

• What are the 4 Parts of Cellular Respiration?
• What is Glycolysis?
• What is produced in Glycolysis?
• Where does Glycolysis occur in a eukaryotic cell?
• Where does it occur in a prokaryotic cell?

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Oxidative Phosphorylation

• 2 Parts
• Electron Transport Chain
• Chemiosmosis
• Electron Transport Chain
• Embedded in inner mitochondrial membrane
• Pumps Protons out of the Inner mitochondrial
  space
• Establishes electrochemical gradient
• Chemiosmosis
• ATP Synthase makes ATP

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Questions

• What are the 4 Parts of Cellular Respiration?
• What is the purpose of Pyruvate Oxidation?
• What is produced in Pyruvate Oxidation?
• For each glucose, how many pyruvate oxidations
  occur?
• Where does the TCA cycle occur in a eukaryotic
  cell?
• Where does it occur in a prokaryotic cell?

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Questions (Page 2)

• For each glucose, how many turns of the TCA cycle
  occur?
• Each turn of the TCA cycle produces how much
• CO2?
• ATP?
• NADH?
• FADH2?
• What are the 2 alternate names for the TCA cycle?

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Fermentation

• 2 Forms
• Lactic Acid fermentation
• Alcoholic fermentation
• Glycolysis 1 extra step (Recycles NAD)
• Does NOT use oxygen

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Fermentation

• Lactic Acid Fermentation
• 3-Carbon ? 3-Carbon
• 3-carbon Lactate or Lactic acid
• Muscles
• Alcoholic Fermentation
• 3-Carbon ? 2-Carbon
• 2-Carbon Ethanol
• CO2
• Beer or wine