After studying this chapter you will be able to: Explain in general terms how redox reactions are involved in energy exchanges; name the three stages of cellular respiration, for each, state the region of the eukaryotic cell where it occurs and the products that result; in general terms, explain the role of the electron transport chain in cellular respiration;. | Lecture Biology (7th edition) - Chapter 9: Cellular respiration: Harvesting chemical energy Chapter 9 Cellular Respiration: Harvesting Chemical Energy PowerPoint Lectures for Biology, Seventh Edition Neil Campbell and Jane Reece Lectures by Chris Romero Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Overview: Life Is Work • Living cells – Require transfusions of energy from outside sources to perform their many tasks Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • The giant panda – Obtains energy for its cells by eating plants Figure Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Energy – Flows into an ecosystem as sunlight and leaves as heat Light energy ECOSYSTEM Photosynthesis in chloroplasts Organic CO2 + H2O Cellular + O2 molecules respiration in mitochondria ATP powers most cellular work Heat energ Figure y Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Concept : Catabolic pathways yield energy by oxidizing organic fuels Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Catabolic Pathways and Production of ATP • The breakdown of organic molecules is exergonic Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • One catabolic process, fermentation – Is a partial degradation of sugars that occurs without oxygen Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • Cellular respiration – Is the most prevalent and efficient catabolic pathway – Consumes oxygen and organic molecules such as glucose – Yields ATP Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings • To keep working – Cells must regenerate ATP Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Redox Reactions: Oxidation and Reduction • Catabolic .
