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Lecture7_Metabolism_Notes_A - Essential Cell Biology Third...

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Chapter 13 Glycolytic Metabolism Essential Cell Biology Third Edition Copyright © Garland Science 2010
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Cells store energy during glycolysis Compare the direct burning of sugar to the stepwise oxidation that occurs during glycolysis. Most of the energy is stored in activated carrier molecules. This graph is not scale and a lot of energy is released as heat.
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Energy is transferred and stored in activated carrier molecules ATP contains a high energy phosphoanhydride bond. The hydrolysis of this bond can be coupled to other chemistry. NADH donates electrons to the electron transport chain. The energy from these electrons is used for ATP synthesis.
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Cellular metabolism occurs in three stages In stage one of metabolism food is broken down into smaller subunits (digestion). Food contains proteins, lipids, and polysaccharides These macromolecules must be broken down into amino acids, fatty acids, and sugars before they are useful energy sources. It requires specialized enzymes that can breakdown the macromolecules. This occurs outside of the cell (intestine) or in specialized compartments inside of the cell (the lysozome).
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Cellular metabolism occurs in three stages In stage 2 of metabolism (glycolysis) 1 molecule of glucose is converted to two molecules of pyruvate.
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