In competitive inhibition, the inhibitor molecules I1 and I2 bind to the active sites, preventing the substrate from binding. If the following reactions occur: E+Sk1ESk2E+PE+l1k3k3El1E+I2k4k4EI2 determine the rate of formation of products P (as a function of concentrations of species we can probe and reaction rate constants). The total concentration of the enzyme CE0 is constant