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ATP and Metabolism

ATP and Metabolism. 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. Catabolic Reactions. “downhill” Release of free energy by breaking down complex molecules

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ATP and Metabolism

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  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

  5. Energy Coupling • Endergonic reactions drive exergonic reactions • Photosynthesis drives Cellular Respiration

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

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

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

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