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Biol 1406 notes Ch 9 8thed
Biol 1406 notes Ch 9 8thed

...  The last cytochrome of the chain, cyt a3, passes its electrons to oxygen, which is very electronegative.  Each oxygen atom also picks up a pair of hydrogen ions from the aqueous solution to form water.  The electrons carried by FADH2 have lower free energy and are added at a lower energy level t ...
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... and the energy gap between them is so small that even very little thermal fluctuation can make them heterogeneous under natural conditions. In this hypothesis paper, therefore, the most critical step in the enzyme-catalytic amino acid synthesis is how a homogenous electron spin state forms. A better ...
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... c) in E. coli, complete oxidation of one molecule of glucose yields 32 ATP d) for each molecule of glucose, conversion of pyruvate to acetyl CoA yields 2 NADH e) less energy is captured from oxidation of glucose carbons in glycolysis than from the beta oxidation of fatty acid carbons 22. How many c ...
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... The spent electrons are taken up by oxygen and, along with H +, make water. This explains our need for oxygen and the production of water in the equation. Many poisons exert their effect here. Potassium Cyanide (used in gas chamber during WWII), for example, blocks the passage of electrons to oxygen ...
CHAPTER 9 CELLULAR RESPIRATION: HARVESTING CHEMICAL
CHAPTER 9 CELLULAR RESPIRATION: HARVESTING CHEMICAL

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Electron transport chain



An electron transport chain (ETC) is a series of compounds that transfer electrons from electron donors to electron acceptors via redox reactions, and couples this electron transfer with the transfer of protons (H+ ions) across a membrane. This creates an electrochemical proton gradient that drives ATP synthesis, or the generation of chemical energy in the form of adenosine triphosphate (ATP). The final acceptor of electrons in the electron transport chain is molecular oxygen.Electron transport chains are used for extracting energy via redox reactions from sunlight in photosynthesis or, such as in the case of the oxidation of sugars, cellular respiration. In eukaryotes, an important electron transport chain is found in the inner mitochondrial membrane where it serves as the site of oxidative phosphorylation through the use of ATP synthase. It is also found in the thylakoid membrane of the chloroplast in photosynthetic eukaryotes. In bacteria, the electron transport chain is located in their cell membrane.In chloroplasts, light drives the conversion of water to oxygen and NADP+ to NADPH with transfer of H+ ions across chloroplast membranes. In mitochondria, it is the conversion of oxygen to water, NADH to NAD+ and succinate to fumarate that are required to generate the proton gradient. Electron transport chains are major sites of premature electron leakage to oxygen, generating superoxide and potentially resulting in increased oxidative stress.
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