BIO 121 Lecture Notes - Lecture 5: Endergonic Reaction, Exergonic Reaction, Cellular Respiration
24 Jul 2020
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Document Summary
Cell chemistry achieved by coupling (ender/exer)gonic reactions. Consists of nitrogenous base adenine bonded to ribose, which is attached to sequence of 3 phosphate groups. Energy released from an exergonic reaction is used to phosphorylate adp, which is then dephosphorylated to drive an endergonic reaction. Phosphate groups vely charged repel energy req. to get 2 phosphates near to each other to form cov. bond some of energy req. stored as potential energy in p-o bonds b/n phosphates. Original energy comes from sun trapped by photosynthesis one product is glucose we consume the glucose and burn it through glycolysis, pyruvate is formed cellular respiration or fermentation occurs (o2 prod/not prod) Use light/chem energy to set up proton gradients one side has high conc. of protons. Gateway allows protons to leak back from high conc. to same conc. on either side. Use 2 atps to convert glucose into higher energy molecule.
