1. Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Energy conversions and ATP

2. Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Conversion of solar energy into chemical energy

3. Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Energy flows into ecosystem from sunlight Light energy ECOSYSTEM CO 2 + H 2 O Photosynthesis in chloroplasts Cellular respiration in mitochondria Organic molecules + O 2 ATP powers most cellular work Heat energy Figure 9.2

4. Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings ATP (adenosine triphosphate) – Powers cellular work Figure 8.8 O O O O CH 2 H OH H N HH O N C HC N C C N NH 2 Adenine Ribose Phosphate groups O O O O O O - --- CH

5. Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings E released f/ ATP w hen phosphate bond is broken Figure 8.9 P Adenosine triphosphate (ATP) H2OH2O + Energy Inorganic phosphate Adenosine diphosphate (ADP) PP PPP i

6. Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Regeneration of ATP from ADP ATP ADP + P i Energy for cellular work Energy from metabolism Figure 8.12

7. Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Cellular work p owered by hydrolysis of ATP (c) Chemical work : ATP phosphorylates key reactants P Membrane protein Motor protein P i Protein moved (a) Mechanical work : ATP phosphorylates motor proteins ATP (b) Transport work : ATP phosphorylates transport proteins Solute PP i transportedSolute Glu NH 3 NH 2 P i + + Reactants: Glutamic acid and ammonia Product (glutamine) made ADP + P Figure 8.11