Chapter 8 Notes

Chapter 8 Notes - 2 Release energy – Exergonic reaction...

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Energy, Enzymes and Metabolism Metabolism- the totality of the chemical reactions in a living organism 1. Anabolic reactions- link simple molecules to form complex molecules 2. Catabolic reactions- break down complex molecules The First Law of Thermodynamics Energy can be neither created nor destroyed The Second Law of Thermodynamics The energy will tend toward disorder as you proceed a chemical reaction: more unusable energy after the reaction is done Entropy- disorder energy is going to increase over time H = G + TS H = enthalpy (total energy) G = free energy (available for work) T= absolute temperature (K) S = entropy (unusable energy) Therefore, G = H – TS Δ G = G products – G reactants = Δ H – T Δ S Anabolic reactions increase complexity 1. Free energy + small molecules complex molecules 2. Require energy- Endergonic reaction 3. Free energy is required Catabolic reactions decrease complexity 1. Complex molecules free energy + small molecules
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Unformatted text preview: 2. Release energy – Exergonic reaction Chemical Equilibrium ATP – energy currency 1. Can be used in a lot of different chemical reactions 2. Most common 3. Has Adenine as base 4. ATP is an nucleotide 5. Most energetic b/c It has 3 phosphate groups 6. Building block of nucleic acdis 7. Hydrolysis of ATP- Releases a lot of amount of energy, has to do with the separation b/c P and O 8. Can be use to phsophorylate many molecules 9. ATP ydrolysis: ATP + H2O ADP + Pi + free energy a. Exergonic reaction b. ΔG = -7.3 kcal/mol in lab c. ΔG can be up go -14kcal/mol under cellular conditions ΔG is positibe – krequiresa energy for the reaction to occur Catalyst Substance that speeds up chemical reactions w/o being permanently altered in the process No catalys can make a reaction occur that cannot otherwise occur Most catalysis are proteins called enzymes...
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This note was uploaded on 03/23/2011 for the course BIO 1305 taught by Professor Eldridge during the Fall '08 term at Baylor.

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Chapter 8 Notes - 2 Release energy – Exergonic reaction...

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