Chapter_8_fall_2008_class

Chapter_8_fall_2008_class - INTRODUCTION TO METABOLISM...

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INTRODUCTION TO METABOLISM Metablism is the reactions that occur in cells Cells require a constant input of energy for reactions Paramecium (with alga)
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Cells require a constant input of energy Analogy to respiration Fig. 8.7 Metabolic reactions can require energy (endergonic ) or release energy (exergonic )
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Some definitions Endergonic reaction: a reaction that requires energy from the surroundings to occur. Example: DNA synthesis Exergonic reaction: A reaction that ______________ when it takes place. Example 1: ATP cleavage to ADP and Pi • Example 2: Glucose + O 2 to CO 2 and water
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An important exergonic reaction is hydrolysis of ___ to ADP and phosphate. ATP – Fig. 8.9 ATP ATP ADP + Pi ADP + Pi + + energy energy
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Figure 8.9 The structure and hydrolysis of ATP
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Figure 8.12 The ATP cycle
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In a coupled reaction, an unfavorable reaction (________ reaction) is linked to a very favorable reaction (exergonic reaction) such as ATP cleavage. The favorable cleavage of ATP allows the unfavorable reaction to proceed. Coupled Reactions
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Chapter_8_fall_2008_class - INTRODUCTION TO METABOLISM...

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