1. ATP and Metabolism

2. Metabolism Totality of an organism’s chemical reactions Pathway of defined steps beginning with a specific molecule resulting in a certain product catalyzed by a specific enzyme

3. Catabolic Reactions “downhill” Release of free energy by breaking down complex molecules Cellular respiration Energy that is stored in molecules is available to do work Exergonic Releases free energy

4. Anabolic “uphill” Energy consumed to build complex molecules Photosynthesis Synthesis of proteins from amino acids Endergonic Absorbs free energy

6. Energy Coupling Endergonic reactions drive exergonic reactions Photosynthesis drives Cellular Respiration

7. Cell Work Chemical Synthesis of polymers from monomers Transport Pumping substances against gradient Mechanical Muscle contractions

8. ATP Adenosine Triphosphate By hydrolysis of phosphate ATP yields ADP and releases energy

9. Phosphorylation Phosphate is transferred to another molecule this molecule is phosphorylated Regeneration of ATP