BIOL 1001 Chapter : Chapter 8

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15 Mar 2019
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Glucose (c6h12o6) breakdown begins with glycolysis in the cell cytosol, liberating small quantities of atp. The end product of glycolysis is further broken down during cellular respiration in mitochondria, supplying far greater amounts of energy in atp. In most organisms, if oxygen is available, the second process in glucose breakdown, called cellular respiration occurs. In forming atp during cellular respiration, cells use oxygen and liberate both water and carbon dioxide-the raw materials for photosynthesis. Glycolysis splits a 6-carbon glucose molecule into 2 molecules of pyruvate. 2 stages: energy investment stage and energy harvesting stage. Extracting energy from glucose first requires an investment of energy from atp. During a series of reactions that constitutes the energy investment stage, each of 2 atp molecules donates a phosphate group and energy to glucose, forming an energized molecule of fructose bisphosphate. Next, during the energy harvesting stage, fructose bisphosphate is converted into two 3-carbon molecules of glyceraldehyde-3-phosphate, or g3p.

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