PowerPoint® Lecture Presentations for Biology Eighth Edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by Erin Barley with contributions from Joan Sharp Copyright © | Chapter 9 Cellular Respiration: Harvesting Chemical Energy Overview: Life Is Work Living cells require energy from outside sources Some animals, such as the giant panda, obtain energy by eating plants, and some animals feed on other organisms that eat plants Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings For the Discovery Video Space Plants, go to Animation and Video Files. Fig. 9-1 Figure How do these leaves power the work of life for the giant panda? Energy flows into an ecosystem as sunlight and leaves as heat Photosynthesis generates O2 and organic molecules, which are used in cellular respiration Cells use chemical energy stored in organic molecules to regenerate ATP, which powers work Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Fig. 9-2 Light energy ECOSYSTEM Photosynthesis in chloroplasts CO2 + H2O Cellular respiration in mitochondria Organic molecules + O2 ATP powers most cellular work Heat energy . | Chapter 9 Cellular Respiration: Harvesting Chemical Energy Overview: Life Is Work Living cells require energy from outside sources Some animals, such as the giant panda, obtain energy by eating plants, and some animals feed on other organisms that eat plants Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings For the Discovery Video Space Plants, go to Animation and Video Files. Fig. 9-1 Figure How do these leaves power the work of life for the giant panda? Energy flows into an ecosystem as sunlight and leaves as heat Photosynthesis generates O2 and organic molecules, which are used in cellular respiration Cells use chemical energy stored in organic molecules to regenerate ATP, which powers work Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Fig. 9-2 Light energy ECOSYSTEM Photosynthesis in chloroplasts CO2 + H2O Cellular respiration in mitochondria Organic molecules + O2 ATP powers most cellular work Heat energy ATP Figure Energy flow and chemical recycling in ecosystems Concept : Catabolic pathways yield energy by oxidizing organic fuels Several processes are central to cellular respiration and related pathways Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Catabolic Pathways and Production of ATP The breakdown of organic molecules is exergonic Fermentation is a partial degradation of sugars that occurs without O2 Aerobic respiration consumes organic molecules and O2 and yields ATP Anaerobic respiration is similar to aerobic respiration but consumes compounds other than O2 Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Cellular respiration includes both aerobic and anaerobic respiration but is often used to refer to aerobic respiration Although carbohydrates, fats, and proteins are all consumed as fuel, it is helpful to trace cellular respiration with the sugar glucose: C6H12O6 + 6 O2 6 CO2 + 6 H2O + Energy (ATP + .
