Download - Glycolysis and krebs - Science to a Tee
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C2 ATP
GlycolysisElectron
Transport Chain
32 ATP
6O2
6H2O
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CPyruvate oxidation
CO2C2
Citric Acid Cycle
2 ATP
CO2C4
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How the Krebs Cycle Works
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Aerobic Respiration:Glycolysis, Pyruvate Oxidation & the Citric
Acid Cycle
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• Before pyruvate enters the Krebs Cycle, it is oxidized in the transition step.
• Pyruvate molecules are actively transported into the mitochondrial matrix.
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`• Carbon dioxide is removed from the pyruvate • Hydrogen atoms are removed and transferred to NAD+. • reactions are carried out by enzymes • A 2-carbon compound called an acetyl group is
formed & is attached to coenzyme A. • The resulting acetyl CoA can enter the Citric Acid
Cycle.
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Citric Acid Cycle
NADH= FADH2= ATP=
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Aerobic Respiration:Glycolysis, Pyruvate Oxidation & the Citric
Acid Cycle
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The Citric Acid Cycle (Krebs)
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The Citric Acid (Krebs) Cycle
• Acetyl CoA from the transition step is combined with a 4C compound called oxaloacetate, forming 6C citrate.
• Citrate undergoes a series of decarboxylation and dehydrogenation reactions which result in the regeneration of oxaloacetate.
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The Krebs Cycle
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Krebs!!
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Products of the Krebs Cycle• Each turn of the Krebs Cycle produces:
4 molecules of reduced NAD+ (1 from Pyr Ox) 1 molecule of reduced FAD
1 molecule of ATP 3 molecules of CO2 (1 from Pyr.Ox.)
• The Krebs Cycle turns twice for every glucose molecule broken down; per glucose molecule the yield is doubled: 8 NAD+; 2 FAD; 2ATP and 6 CO2
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