Biology 1002B Lecture Notes - Glutamine, Exergonic Reaction, Thermodynamics
9 Sep 2013
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Document Summary
Thermodynamics: is the field of science that deals with energy and energy transformation. System: what we are interested in studying (cell, planet, galaxy) Isolated: neither energy or matter move in or out. Closed: energy moves in and out, but matter can"t (earth is a closed system) Total energy is constant (but you can transform it) Every energy transformation increases the disorder of the universe. The disorder of an isolated system always go up. Physical objects always break down (entropy at play: reason why translation never stops, proteins always break down. Proteins are constantly breaking down (this is why photosynthesis slows down in isolated mitochondria and chloroplasts because it can"t be resupplied with new proteins) You can"t stop transcription/translation because proteins keep breaking down. Conditions needed : products have lower potential energy than the reactants. Products are less ordered than the reactant molecules. Free energy, energy which you can actually use in a system. G = h -t s.
