Cell bio ch 3 - 1/22/12 Living things do stuff Essential...

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1/22/12 1 Chapter 3 Energy, Catalysis and Biosynthesis Essential Cell Biology Third Edition Copyright © Garland Science 2010 Living things do stuff • Do stuff in a purposeful way • To do stuff they need reagents and energy (metabolism) • To accelerate/catalyze doing stuff cells use enzymes Figure 3-1 Essential Cel Biology (© Garland Science 2010) Enzymatic reactions are often connected Figure 3-2 Essential Cel Biology (© Garland Science 2010) Metabolism
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1/22/12 2 Organisms, while organized, still follow the 2 nd Law of Thermodynamics Figure 3-5 Essential Cel Biology (© Garland Science 2010) By creating order locally, cells produce heat--energy’s most disordered form 1 st Law of Thermodynamics = energy can be converted from one form to another, but it can not be destroyed. So…. .where does this heat come from? Energy can take many forms chemical energy
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1/22/12 3 photosynthesis chemical energy Figure 3-10 Essential Cel Biology (© Garland Science 2010) Figure 3-8 Essential Cel Biology (© Garland Science 2010) Plant photosynthesis carbon fxation light energy + CO 2 + H 2 0 à sugars + O 2 + heat energy Figure 3-9 Essential Cel Biology (© Garland Science 2010) Sugars then used as: 1) chemical energy source 2) building blocks For other organic molecules Photosynthesis and respiration are complementary processes
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1/22/12 4 Cells obtain energy by the oxidation of organic molecules In both plants and animals, energy is extracted from food by process of controlled burning/gradual oxidation . On Earth, the most stable form of carbon is CO 2 and the most stable form of hydrogen is H 2 O. Cells then utilize these preferences to drive produce energy
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This note was uploaded on 01/26/2012 for the course BIOL 4374 taught by Professor Staff during the Spring '08 term at University of Houston.

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Cell bio ch 3 - 1/22/12 Living things do stuff Essential...

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