involve the conversion of NAD+ to NADH. Because both glycolysis and the Krebs cycle produce NADH‚ both of these processes shut down when there is no available NAD+. 5. If the Krebs cycle does not require oxygen‚ why does cellular respiration stop after glycolysis when no oxygen is present? When no oxygen is present‚ oxidative phosphorylation cannot occur. As a result‚ the NADH produced in glycolysis and the Krebs cycle cannot be oxidized to NAD+. When no NAD+ is available‚ pyruvate cannot be converted
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Cellular respiration includes the processes of glycolysis‚ krebs cycle‚ and the electron transport chain. Glycolysis is used to convert glucose to produce two pyruvate as well as 4 ATP’s and 2 NADH but uses 2 ATP to have a net product of 2 ATP and 2 NADH. The krebs cycle converts pyruvate to Acetyl CoA‚ which produces 2 ATP‚8 NADH‚ and 2 FADH’s per glucose molecule. Electron transport Chain is the last and most important
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glycolysis‚ glucose (6 C) is broken into 2 pyruvic acid (3 C) 2 ATP is produced and 2 NADH come in to keep the energy released from broken bonds. The Bridge Before going to the Kreb’s cycle 2 pyruvic acid (3C) becomes 2 Acetyl CoA (2 C). As a result‚ 2CO2 is produced and 2NADH comes in the keep the energy released. Kreb’s Cycle Takes place in the cytoplasm for prokaryotes or in the mitochondria for eukaryores. Two Acetyl CoA spin around the Kreb’s cycle—one time for each. At the end‚ 2 Acetyl CoA
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1 Two critical ingredients required for cellular respiration are glucose and oxygen. Cellular Respiration‚ process in which cells produce the energy they need to survive. In cellular respiration‚ cells use oxygen to break down the sugar glucose and store its energy in molecules of adenosine triphosphate (ATP). Cellular respiration is critical for the survival of most organisms because the energy in glucose cannot be used by cells until it is stored in ATP. Cells use ATP to power virtually all of
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reactions and pathways involved. Cellular Respiration can be divided into three metabolic processes; Glycolysis that occurs in the cytoplasm‚ Krebs cycle that takes place in the matrix of the mitochondria‚ and Oxidative phosphorylation that occurs via the electron
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organisms produce adenosine triphosphate (ATP) as a source of energy for cellular work‚ using cellular respiration. Cellular respiration is a process that involves glycolysis -breaking down glucose into two molecules of 3- carbon pyruvate‚ the Krebs cycle - oxidizing organic fuel derived from pyruvate-‚ and the electron transport chain - moving electrons through a series of protein complexes to generate ATP (Reece‚ et.al‚ 2011). The process of cellular respiration occurs in the Cytoplasm and the Mitochondria
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cellular respiration and fermentation is easy to learn. However it is more difficult to learn the process of glucose being converted into energy. Cellular respiration has four stages‚ of which a phase can consist of eight or ten steps. In the Krebs Cycle alone‚ there are ten steps‚ where the input of Acetyl CoA is eventually reconverted back into oxaloacetate. Fermentation is also no different. It can be difficult for students to understand what the role of NADH is in the fermentation process. For
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The only cells in our body that can metabolize ethanol are in our liver. In the cells NAD+ oxidizes the ethanol to acetic acid‚ which generates an excess amount of NADH‚ which gives its electrons to the ETC. Then Oxidative phosphorylation occurs without the Krebs cycle. The carbohydrates that normally enter the Krebs cycle are turned to fat because the Krebs cycle is turned off. The fat is then secreted by the liver into the blood. The ethanol enters our bloodstream through our intestines
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through cellular respiration convert energy into ATP. They do this in three distinct stages; glycolysis‚the Krebs cycle and the electron transport chain. The Krebs cycle and electron transport chain are both aerobic process and require oxygen. In certain conditions where oxygen is not present or is low some organisms switch from cellular respiration into alcoholic or lactic acid fermentation. Fermentation is an anaerobic‚ metabolic pathway used to oxidize nicotinamide adenine dinucleotide
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Link reaction The link reaction takes place in the mitochondrial matrix and its main function is to turn the pyruvate into acetate for the kerb cycle. During the link reaction the pyruvate molecule undergoes decarboxylation and dehydrogenation‚ the enzymes pyruvate decarboxylase and pyruvate dehydrogenase remove the carboxyl group (which becomes a carbon dioxide molecule) and removes the hydrogen atoms from the pyruvate molecule. The coenzyme NAD accepts the two hydrogen atoms and becomes reduced
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