The expression of the Michaelis constant is equal to A) (K₂ + K₃)/K₁ B) (K₂ + K₁_./K₃ C) (K₁ + K₂)/K₃ D) (K₃ + K₁) + K₃ E) (K₂/K₁) + K₃ Where K₁ = the rate constant for ES formation K₂ = the rate constant for ES dissociation K₃= the rate constant for product formation

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The Michaelis constant (K_m) is a measure of the affinity of an enzyme for its substrate. It is defined as the substrate concentration at which the reaction rate is half of the maximum rate. The Michaelis constant can be expressed in terms of the rate constants for the individual steps of the reaction. The correct answer is A, (K₂ + K₃)/K₁. This expression represents the ratio of the rate constants for ES dissociation and product formation to the rate constant for ES formation.

The Expression of the Michaelis Constant Is Equal to