Chapter 6 � Energy and Metabolism

Chapter 6 â�� Energy and Metabolism - • How does it...

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Chapter 6 – Energy and Metabolism 07/04/2008 23:55:00 Energy – the capacity to do work Kinetic – motion Potential – stored energy Oxidation releases energy Breaking bonds requires energy, making releases free energy : the energy available to do work Gibb’s free energy, G The energy contained in a molecule’s chemical bonds (enthalpy) – the energy  unavailable because of disorder (entropy) times the absolute temperature (K) o H – TS = G When G is positive, the products have more free energy than the reactants:  they do not proceed spontaneously because they require the input of energy  (ENDERGONIC) When G is negative, products have less energy than reactants: spontaneous  (EXERGONIC) ATP
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Unformatted text preview: • How does it store energy? o Lies in its triphosphate group o Phosphate groups are highly negatively charged, and thus they strongly repel one another o Therefore, the covalent bonds between them are highly unstable o Since they are unstable, they have a low activation energy, and are easily broken in hydrolysis (negative G). ← ← all chemical reactions carried out by an organism is called metabolism • those chemical reactions that expend energy to make or transform chemical bonds are called anabolic reactions or anabolism • reactions that harvest energy when chemical bonds are broken are called catabolic reaction, or catabolism 07/04/2008 23:55:00 ← 07/04/2008 23:55:00 ←...
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Chapter 6 â�� Energy and Metabolism - • How does it...

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