notes 2-2 - M etabolism -The sum of all the chemical...

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Metabolism -The sum of all the chemical processes carried out by living organisms Anabolism: reactions that require energy to synthesize complex molecules from simpler ones Catabolism: reactions that release energy by breaking complex molecules into simpler ones that can be reused as a building blocks -All catabolic reactions involve electron transfer which is directly related to oxidation & reduction Fig 5.1 Oxidation: the loss or removal of electrons Reduction: the gain of electrons Table 5.1 Fig 5.2 Fig 5.3 -plants do both (photosynthesis and cellular respiration) -humans only cellular respiration Properties of Enzymes -In general, chemical reactions that release energy can occur with input of energy -The oxidation of glucose releases energy, but the reaction does not occur without an input of energy -Activation energy: the energy requires to start such a reaction *Enzymes lower the activation energy so reactions can occur at mild temperatures in living cells Fig 5.4 Fig 5.5 Each substrate binds to an active site, producing an enzyme- substrate complex. The enzyme helps a chemical reaction occur, and one or more products are formed (enzymes
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notes 2-2 - M etabolism -The sum of all the chemical...

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