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Cell bio ch 3 - Living things do stuff Essential Cell...

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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 Cell Biology (© Garland Science 2010) Enzymatic reactions are often connected Figure 3-2 Essential Cell 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 Cell 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 Cell Biology (© Garland Science 2010) Figure 3-8 Essential Cell Biology (© Garland Science 2010) Plant photosynthesis carbon fixation light energy + CO 2 + H 2 0 à sugars + O 2 + heat energy Figure 3-9 Essential Cell 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 from the breakdown of organic molecules by allowing them to combine with oxygen ( oxidation ). Collectively,
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