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 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 Proteins to Amino groups Fatty acids to acetyl groups Intermediates of cellular respiration Figure 7.20

Evolution of Metabolism 1. Degrading Carbon Based Molecules 2. Glycolysis 3. Anaerobic Photosynthesis 4. Aerobic Photosynthesis 5. Nitrogen Fixation 6 Aerobic Respiration