Elcdectron Transport
Electron transport is the last phase and most important phase of cell respiration. It accounts for most of the ATP made in cell respiration. Cell respiration makes a total of thirty eight ATP's, two from Glycolysis, two from the Krebs cycle and thirty four from electron transports. Electron transport takes place after Glycolysis and the Krebs cycle. Glycolysis and the Krebs cycle make their ATP through substrate level Phosphorylation while electron transport makes its ATP through oxidative phosphorylation. Glycolysis and the Krebs cycle are important to electron transport; NADH carries electrons from glycolysis to the spot where electron transport takes place. NADH and FADH2 carry the electrons from the Krebs cycle to the spot of electron transport. So with out Glycolysis or the Krebs cycle electron transport would not take place. The electron transport chain is located in the inner membrane of the mitochondrion. It is made up of a collection of molecules that are set up in a way that each molecule is less electronegative than the molecule below it. So like a set of stairs as you go down the stairs each molecule becomes more electronegative and then when you get to the second to last
The electron transport chain makes no ATP directly. Its function is to ease the fall of electrons from food to oxygen, breaking a large free energy drop into a series of smaller steps that release energy in manageable amounts. The mitochondrion couple this electron transport and energy release to ATP synthesis this is called cheiosmosis. Populating the inner membrane of the mitochondria are many copies of the protein complex ATP synthase, this is the enzyme that actually makes ATP. It works like an ion pump but in the opposite direction. If you remember right on ion pump uses ATP as the energy source to run the pump. In the reverse of that process, an ATP synthase uses the energy of an existing ion gradient to power ATP synthase. The ion gradiant that drives oxidative phosphorylation is a proton gradient; that is, the power source for the ATP synthase is a difference in the concentration of protons on opposite sides of the inner mitochondrial membrane. We can also think of this gradient as a difference in pH, since pH is a measure of proton concentration. The chain is an energy converter that uses the exergonic flow of electrons to pump hydrogen across the membrane, from the matrix into the inter membrane space. The
Some common words found in the essay are:
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Approximate Word count = 831
Approximate Pages = 3 (250 words per page double spaced)
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