Lecture 6 - Lecture 5 An Introduction to Metabolism Chapter...

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1 1 Lecture 5 An Introduction to Metabolism Chapter 8 Goals for This Lecture 2 1. Understand the terms: exergonic, spontaneous, endergonic and non-spontaneous 2. Learn the mean of ΔG for spontaneous and non-spontaneous reactions 3. Learn the role of ATP in driving reactions, particularly non- spontaneous reactions 4. Learn the role of Enzymes in catalyzing a reaction 5. Learn the different types of Enzyme Inhibitors and how they function 6. Learn the different types of RNA enzymes and their functions
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2 3 What is Metabolism? Sum total of all chemical reactions that occur within an organism Also refers to specific chemical reactions at the cellular level
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3 5 Chemical reactions 2 factors govern fate of a chemical reaction Direction Many cells use ATP to drive reactions in 1 direction Rate Catalysts called enzyme can speed the reaction rate aA + bB ↔ cC + dD 6 Energy Ability to promote change 2 forms Kinetic- associated with movement Potential- due to structure or location Chemical energy- energy in molecular bonds
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4 7 2 Laws of thermodynamics 1. First law Law of conservation of energy Energy cannot be created or destroyed 2. Second law Transfer or transformation of energy from one form to another increases entropy or degree of disorder of a system 8 Change in free energy determines direction Energy transformations involve an increase in entropy Entropy - a measure of the disorder that cannot be harnessed to do work
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5 9 H = G + TS H= total energy (enthalpy) G= free energy or amount of energy for work S= change in entropy or unusable energy T= absolute temperature in Kelvin (K) 10 Spontaneous reactions? Occur without input of additional energy Not necessarily fast Key factor is the free energy change ΔG < 0
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6 Fig. 8-6 Reactants Energy Free energy Products Amount of energy released (∆ G < 0) Progress of the reaction (a) Exergonic reaction: energy released Products Reactants Energy Amount of energy required (∆ G
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This note was uploaded on 03/06/2012 for the course ECON 200 Bones taught by Professor Dr.elwonger during the Winter '12 term at Ohio State.

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Lecture 6 - Lecture 5 An Introduction to Metabolism Chapter...

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