Chapter 7 - Chapter 7: Pathways that Harvest Chemical...

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Chapter 7: Pathways that Harvest Chemical Energy I. Metabolic Pathways a. Complex chemical transformations in a cell occurring in a series of separate rxns b. Each rxn in a pathway is catalyzed by specific organism c. Similar in all living organisms d. Compartmentalized in eukaryotes e. Regulated by key enzymes f. Glycolysis i. Glucose to pyruvate ii. Exergonic iii. No O 2 g. Cellular respiration i. Pyruvate into 3 CO 2 ii. Highly exergonic as ATP iii. Uses O 2 h. Fermentation i. Pyruvate to lactic acid/ethyl alcohol ii. No O 2 II. Metabolism of Glucose a. C 6 H 12 O 6 + 6O 2 yields 6CO 2 + 6 H 2 O + free energy b. Traps stored energy of glucose in ATP i. ADP + P i + free energy yields ATP ii. Highly endergonic III. Energy from glucose a. O 2 available i. Glycolysis ii. To pyruvate oxidation iii. To citric acid cycle iv. ETC b. O 2 unavailable i. Glycolysis ii. To fermentation IV.Electron Transfer a. Transfer electrons = energy i. Energy in reducing agent transferred to reduced product or stays in reducing agent b. Redox i. Reduction – gain electron ii. Oxidation – lose electron c. Glucose = reducing agent d. O 2 = oxidizing agent e. NAD = common electron carrier V. Glycolysis a. Energy Investing Reactions (endergonic)
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i. Glucose
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This note was uploaded on 01/27/2011 for the course BIOSC 0150 taught by Professor Lydiadaniels during the Fall '08 term at Pittsburgh.

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Chapter 7 - Chapter 7: Pathways that Harvest Chemical...

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