Which of the following statements best describes a feature of Michaelis-Menten kinetics?
1) The shape of the V_0 vs [S] curve is a parabola.
2) All enzyme-catalyzed reactions follow Michaelis-Menten kinetics.
3) Km is the [S] at which V_0= displaystyle frac12 V_max.
4) Enzymes with multiple substrates reach V_max quickly.
