BIOL 1201 : Exam 2 Material Bio 1201
Document Summary
Atp is phosphorylation reactions: transfer of high energy phosphate to another molecule, catalyzed by enzyme. Delta g: values are additive, the energy available in atp can be coupled to an endergonic reaction. Coupling reactions: exergonic reactions supply energy so that energetically unfavorable (endergonic) reactions can occur. Atp is termed energy currency of the cell: compounds can be expressed in terms of their biosynthetic cost in. Atp: metabolites can be expressed in terms of atp equivalents. The conditions for producing atp and utilizing atp: different, must be controlled. By using atp coupling: processes can have thermodynamic feasibility in the appropriate direction. How are substrates lured into the active site: circe effect. Circe: enchantress of greek myth, lured odysseus and his men with their siren song, turned odysseus"s companions into swine. Circe effect: lure substrate into active site, positively charged arginine side chain lures negatively charged metabolite into the active site, substrate turned into product.
