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### 18 Cards in this Set

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 V= d[P] /dt is also what? V= -d[S]/dt With decreasing [S] and increasing [P] , what wil be lost with time of reaction? linearity, in some cases P may inhibit E at higher concentrations. All E in the form of ES is what? Saturated When saturation is at high [S] increasing the [S] doesn't do what? increase the rate of reaction any further The velocity obtained at saturating [S] is what? the maximum velocity (Vmax) What is Michaelis's constant? [S] is 1/2 the Vmax. The term is called the Km What units are Km expressed in? moles/liter or mg/ml V=Vmax[S]/[S]+Km is also what? Km=[S](Vmax-V)/V so when, 2V=Vmax, Km=[S] Km is sometimes associated with what? the strength of binding of the substrate for the enzyme. A substance with low dissociation rate is what type of affinity? higher affinity A substrate with low dissociation rate (high affinity)for the enzyme would reach what? half-maximal velocity at lower [S] A turnover number of enzyme reactions is what? Kcat The larger the Kcat the more often what happens on the surface of the enzyme? catalytic events Units of Kcat are per what? What does Kcat measure? per seconds, that is (s^-1) measures number of substrate molecules turned over per enzyme per second. Values range from chymotypsin (0.1) to carbonic anhydrase (100,000). The Kcat/Km determines the efficency of the enzyme-mediated reaction by giving what? The percentage of the effective collisions. True or False Some enzymes approach the theoretical limit where close to every collision result in catalysis. True. Cells far from the thermodynamic equilibrium are in what state? The steady state. A dead cell is at what? equilibrium