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Cellular Respiration
Chapter 7
Harvesting Energy
• Autotrophs vs Heterotrophs
• Cellular Respiration- the oxidation of
organic compounds to extract energy from
chemical bonds
Getting Energy from Food
• Digestion
• Breaking bonds
• Redox reactions
– Dehydrogenations
Electron Transport
• Happens in
stages…why
important?
• Aerobic vs
anaerobic
respiration
• Electron Carriers
2 Steps in the oxidation of
glucose
• Substrate Level
Phosphorylation
• Oxidative
Phosphorylation
Overview of Aerobic Respiration
Stages of Cellular Respiration
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Glycolysis
Pyruvate Oxidation
Krebs Cycle
ETC and Chemiosmosis
Products Of Glycolysis
Glucose + 2 ADP + 2 P + 2
NAD+
2 pyruvate + 2
ADP + 2 NADH + 2 H+ + 2
H2O
Recycling NADH
• Aerobic Respiration
• Fermentation
The Fate of Pyruvate
Oxidation of Pyruvate to Produce
Acetyl-CoA
Pyruvate+ NAD+ + CoA
acetyl-CoA + NADH + CO2 + H+
Krebs Cycle
ETC- Creates and Electron
Gradient
ATP SYNTHASE
• ETC and Chemiosmosis
Energy Yield
Actual vs Theoretical
• 30 vs 36…why?
Regulation of Aerobic
Respiration
• Feedback Inhibition
• Figure 7.17
Oxidation without Oxygen
• Methanogens use CO2
• Sulfur bacteria use Sulfate
• Fermentation
– Alcoholic
– Lactic acid
Alcoholic Fermentation
Lactic Acid Fermentation
Catabolism of Proteins and Fats
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•
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•
Proteins to Amino groups
Fatty acids to acetyl groups
Intermediates of cellular respiration
Figure 7.20
Evolution of Metabolism
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1. Degrading Carbon Based Molecules
2. Glycolysis
3. Anaerobic Photosynthesis
4. Aerobic Photosynthesis
5. Nitrogen Fixation
6 Aerobic Respiration