It either exists in the T state in which this enzyme is inactive or it exists in the r state in which the enzyme is fully active. And it's the concentration of the substrate inside the cell that ultimately determines where the equilibrium will actually lie. And a high substrate concentration, the enzymes coronary structure will exist in the r state while at low substrate concentrations the enzymes coronary structure will exist in the T state. Now, if we take a look at the following diagram, we have three different curves. So the y axis is the rate of product formation for this enzyme catalyzed reaction and the x axis is the concentration of that substrate molecule. Now, at low concentration of the substrate molecule, we're going to exist predominantly in the T state.