ATP and Metabolism. Metabolism Totality of an organism’s chemical reactions Pathway of defined steps beginning with a specific molecule resulting in a.

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Presentation transcript:

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 Cellular respiration Energy that is stored in molecules is available to do work Exergonic Releases free energy

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

Energy Coupling Endergonic reactions drive exergonic reactions Photosynthesis drives Cellular Respiration

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

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

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

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