lecture 9_notes

Lecture 9_notes - Lecture 9 Harvesting of energy Cells need energy to function to stay alive and to grow and multiply Without energy a cell is dead

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Lecture 9 Harvesting of energy 1SFNJTF Cells need energy to function, to stay alive, and to grow and multiply. Without energy, a cell is dead Energy is harvested from energy-rich compounds by controlled "burning" Sugars, fats, amino acids are energy rich Why, they have energy-rich electrons: C-H, C-C, C-OH In the process of burning, e- are transfered from E-rich molecule to acceptor molecules, such as O2 Energy-poor compounds are produced: O=C=O, H-O-H Reaction where electrons are transfered are called reduction-oxidation rxs D-e (donor, reduced) + A (acceptor, oxidized) -> D (oxidized) + A-e (reduced) In many redox rxs e- travel with proton, i.e. as a H unit H are stripped from glucose as packages of high energy glucose + O2 -> CO2 + H2O, G° = 686 kcal Problem: redox rx are easy to carry out, but energy handling is problem Energy released >> heat How to capture this energy? E must be broken down in small quantities. Each energy packet is going to be stored in
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This note was uploaded on 06/07/2009 for the course BIS BIS2A taught by Professor Lucacomai during the Spring '09 term at UC Davis.

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Lecture 9_notes - Lecture 9 Harvesting of energy Cells need energy to function to stay alive and to grow and multiply Without energy a cell is dead

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