(The NADH generated from glycolysis cannot easily enter mitochondria.) Thus, electrons are picked up on the inside of mitochondria by either NAD or FAD . Another source of variance stems from the shuttle of electrons across the membranes of the mitochondria. For example, the number of hydrogen ions that the electron transport chain complexes can pump through the membrane varies between species. The number of ATP molecules generated from the catabolism of glucose varies. The extra electrons on the oxygen attract hydrogen ions (protons) from the surrounding medium, and water is formed. At the end of the pathway, the electrons are used to reduce an oxygen molecule to oxygen ions. These atoms were originally part of a glucose molecule. ![]() The overall result of these reactions is the production of ATP from the energy of the electrons removed from hydrogen atoms. Recall that the production of ATP using the process of chemiosmosis in mitochondria is called oxidative phosphorylation. \)) is used to generate 90 percent of the ATP made during aerobic glucose catabolism it is also the method used in the light reactions of photosynthesis to harness the energy of sunlight in the process of photophosphorylation.
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