Chapter 9 Notes

Chapter 9 Notes - Chapter 9 Notes Cellular Respiration and...

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Chapter 9 Notes Cellular Respiration and Fermentation ATP (adenosine triphosphate): high potential energy that allows cells to do work o No life without ATP ADP (adenosine diphosphate) what a phosphate group is transferred to to make ATP Glucose: the most common fuel used by organisms produces ATP The ability to use and acquire energy Metabolism: all the chemical reactions that occur in living cells 9.1: The Nature of Chemical Energy and Redox Reactions Chemical energy is a form of potential energy Potential energy is associated with position and configuration Chemical energy’s position is electrons Electron close to negative charges and far from positive charges in nuclei high PE The potential energy of a molecule is a function of the way its electrons are configured or positioned The Structure and Function of ATP Phosphate groups contain four confined negative charges, which repel each other Makes the PE of the electrons in the phosphate groups really high Exergonic: releases energy Endergonic: require input of energy ATP with water in hydrolysis reaction, outermost phosphate group breaks off and ADP and inorganic phosphate is formed exergonic o 7.3 kilocalories released with every mole of ATP a kcal of energy raises 1 g of water 1*C Why Does ATP Hydrolysis Release Energy? o Changes in free energy depend on the relationship between reactants and products in terms of PE and entropy (disorder) o Hydrolysis of ATP = exergonic b/c the entropy of the product molecules is much higher than that of the reactants and PE drops when Pi and ADP are formed from ATP What Happens When Proteins Are Phosphorylated By ATP? o Cells don’t loose the 7.3 kcal/mole as heat use to make things happen when ATP is hydrolyzed and the phosphate group that is released becomes a protein o Phosphorylation: the addition of a phosphate group to a substrate o Phosphorylation of proteins is exergonic because the electrons in ADP and in
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This note was uploaded on 02/12/2012 for the course SCI 2341 taught by Professor Yates during the Spring '11 term at Alabama.

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Chapter 9 Notes - Chapter 9 Notes Cellular Respiration and...

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