K_M is A)a measure of the catalytic efficiency of the enzyme. B)equal to half of V_max C)the rate constant for the reaction ES $\to$ E + P. D)the [S] that half-saturates the enzyme. E)a ratio of substrate concentration relative to catalytic power.

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K_M is the substrate concentration at which the enzyme is half-saturated, also known as the Michaelis-Menten constant.

KM Is A)a Measure of the Catalytic Efficiency of the Enzyme

K_M Is
A)a Measure of the Catalytic Efficiency of the Enzyme