THE ENERGY SCORE FOR AEROBIC RESPIRATIONA BALANCE SHEET.. Bs zoologist semester 1 Animal life 1
THE ENERGY SCORE FOR AEROBIC RESPIRATION
A BALANCE SHEET..
The eukaryotic cell obtains a net gain of 36 ATP molecules from the breakdown of each glucose molecule.
Glycolysis: Glycolysis produces four ATP molecules. But two are used in the glycolytic reactions. The two molecules of NADH formed during glycolysis produce six ATP molecules. But two are used in the reactions that transport the NADH electrons across the inner mitochondrial membrane into the matrix.
2. Formation of acetyl COA: One molecule of NADH is produced for each pyruvate converted into acetyl-coenzyme A. One molecule of CO2 is released as acetyl coenzyme A enters into the Krebs cycle. 3. Krebs cycle: Two more ATP molecules are produced in the Krebs cycle. Similarly, six NADH and two FADH2 molecules are produced during Krebs cycle.
4. Electron Transport Chain:..Six NADH come from the Krebs cycle and two NADH come from the entry of acetyl-coenzyme A into the electron transport chain. They yield 24 ATP molecules. The oxidation of the two molecules of FADH2 yields four more molecules of ATP. The net gain from all of these reactions is 36 molecules of ATP.
The electron transport chain is more efficient than glycolysis for producing ATP. But Glycolysis can produce ATP in anaerobic conditions. But the Krebs cycle and electron transport chain cannot do so.
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