Cellular Respiration.dotx - Cellular Respiration How does...

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Cellular Respiration How does Glucose oxidation Release Energy? When glucose is oxidized to CO 2 , it can be done using 1. Combustion – energy released as heat/light (not very efficient) 2. Metabolism – series of metabolic pathways catalyzed by enzymes Energy is captured as ATP a) Energy can transfer to ATP through phosphorylation (adding a phosphate) b) Energy can also be transferred using electrons in REDOX reactions More on a) Phosphorylation De-phosphorylation This is an endergonic reaction with the addition of a PO 4 3- molecule This is an exergonic reaction releasing the PO 4 3- molecule using hydrolysis More on b) Reduction Oxidation Gaining an electron (e - ) where energy is consumed (endergonic) Losing an electron where energy is released (exergonic) Carbon atoms in glucose are oxidized and oxygen atoms in water are reduced This makes glucose a reducing agent, and oxygen an oxidizing agent Energy is transferred in redox reactions using Intermediate Energy Carriers NAD + FAD
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