BIEN 210 Lecture 11: BIOC after midterm
12 Aug 2018
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Document Summary
Constant input of energy to maintain order in the cell: not violating the second law of thermodynamics disorder always increases. Enzyme catalysis to speed up and control reactions. Coupling of unfavoured and favoured chemical reactions, two ways: linked sequential reactions, storage of energy from favoured reaction by carrier molecules to use separately. Energy from a favorable reaction can be used to drive an unfavorable reaction. As long as the total g is still negative, both reaction can take place. Y z is favorable and has lower g than y x: whatever y molecules, there is a greater probability they will go to z. X z becomes favorable when both reactions take place: net flow in solution together, overtime depletion of x to y and depletion of y to z, at equilibrium, mostly z. As long as final g is negative, many of the intermediate reactions can be unfavorable. Or, if final product is continuously removed, reactions will never reach equilibrium.
