TAILIEUCHUNG - Lecture Biology (6e): Chapter 9 - Campbell, Reece

Chapter 9 - Cellular respiration: Harvesting chemical energy. This chapter presents the following content: Cellular respiration and fermentation are catabolic, energy-yielding pathways; cells recycle the ATP they use for work; redox reactions release energy when electrons move closer to electronegative atoms; | CHAPTER 9 CELLULAR RESPIRATION: HARVESTING CHEMICAL ENERGY Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Section A: The Principles of Energy Harvest 1. Cellular respiration and fermentation are catabolic, energy-yielding pathways 2. Cells recycle the ATP they use for work 3. Redox reactions release energy when electrons move closer to electronegative atoms 4. Electrons “fall” from organic molecules to oxygen during cellular respiration 5. The “fall” of electrons during respiration is stepwise, via NAD+ and an electron transport chain Living is work. To perform their many tasks, cells require transfusions of energy from outside sources. In most ecosystems, energy enters as sunlight. Light energy trapped in organic molecules is available to both photosynthetic organisms and others that eat them. Introduction Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Fig. Organic molecules store energy in their arrangement of atoms. Enzymes catalyze the systematic degradation of organic molecules that are rich in energy to simpler waste products with less energy. Some of the released energy is used to do work and the rest is dissipated as heat. 1. Cellular respiration and fermentation are catabolic, energy-yielding pathways Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Metabolic pathways that release the energy stored in complex organic molecules are catabolic. One type of catabolic process, fermentation, leads to the partial degradation of sugars in the absence of oxygen. A more efficient and widespread catabolic process, cellular respiration, uses oxygen as a reactant to complete the breakdown of a variety of organic molecules. Most of the processes in cellular respiration occur in mitochondria. Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings Cellular respiration is similar to the combustion of gasoline in an automobile engine. The overall process is: Organic .

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