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Cellular Respiration
Energy For Cells
Cellular Respiration Energy is released by breaking the bonds
of food molecules (such as glucose) to make ATP from ADP
ADP = adenosine diphosphate ADP + Pi ATP 2 types
aerobic respiration anaerobic respiration
Cellular Respiration
Aerobic Respiration respiration that
requires oxygen Three steps:
Glycolysis Krebs Cycle Electron Transport
Chain
Aerobic Respiration C6H12O6 + 6O2 6CO2 + 6H2O
38 ATP are produced per molecule of glucose
2 ATP are used, so net ATP is 36 Some energy is lost as heat, so the
actual number will be lower exergonic reaction – energy is released
Glycolysis Occurs in the cytoplasm “splitting sugar” Inputs:
glucose Outputs:
Pyruvic acid NADH ATP
Krebs Cycle Occurs in the mitochondria Inputs:
Pyruvic acid Outputs:
ATP NADH FADH2
CO2
Electron Transport Chain Occurs in the mitochondria Where most of the ATP is produced Inputs:
NADH FADH2
O2
Outputs: ATP Water
Anaerobic Respiration Takes place in the absence of oxygen Occurs in the cytoplasm Fewer ATP are produced – net ATP is 2 Similar to glycolysis with an extra step 2 types
Lactic acid fermentation Alcoholic fermentation
Lactic Acid Fermentation Enzymes break down a glucose molecule
into two lactic acid molecules, making ATP C6H12O6 lactic acid
This process causes the pain in muscle fatigue
Lactic Acid Fermentation
Alcoholic Fermentation Enzymes break down a glucose molecule
into ethanol and CO2, making ATP C6H12O6 2 ethanol + 2 CO2
This process is used… to produce alcohol in gasoline additives in baking
Alcoholic Fermentation
Photosynthesis vs. Respiration