APK3110-Ch3-Bioenergetics_Spring+2012_R_part+A

APK3110-Ch3-Bioenergetics_Spring+2012_R_part+A -...

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Unformatted text preview: BIOENERGETICS CHAPTER 3 Review of Basic Cell Structure Plasma Membrane semipermeable barrier Nucleus DNA regulates protein synthesis which determines cell composition and activity. Cytoplasm fluid portion of cell; contains organelles and enzymes Figure 3.1 Introduction to Metabolism Bioenergetics : transferring energy from foodstuffs (i.e., fats, proteins, carbohydrates) into a biologically usable form Metabolism : the sum of all chemical reactions that occur in the body Anabolic reactions synthesis of more complex molecules from simpler substances Catabolic reactions breakdown of complex molecules to simpler substances A + B C + D products reactants Energy Changes in Reactions All chemical reactions involve a change in energy (E) Endergonic (endothermic) reactions: Energy required Positive E Example: boiling water Exergonic (exothermic) reactions: Energy released Negative E Example: glucose breakdown reactants products + energy reactants + energy products Figure 3.3 The total energy released in combustion or after several controlled steps is equal Energy-releasing (exergonic) reactions power energy- requiring (endergonic) reactions. Figure 3.4 Coupled reactions H + are often lost with the electrons Oxidation-reduction are always coupled reactions because a molecule cannot become oxidized unless it donates electrons to another molecule. electrons to another molecule....
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This note was uploaded on 02/15/2012 for the course APK 3110C taught by Professor Dr.christou during the Spring '11 term at University of Florida.

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APK3110-Ch3-Bioenergetics_Spring+2012_R_part+A -...

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