Regarding enzyme kinetics,the substrate concentration at which the reaction velocity is equal to 0.5 V_max is referred to as:

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The substrate concentration at which the reaction velocity is equal to 0.5 V_max is referred to as the Michaelis constant (KM). It is also known as the substrate concentration at half-maximum velocity and is defined by the equation KM = (k-1 + k2)/k1, where k1, k-1, and k2 are constants of the enzyme-substrate complex formation and dissociation. KM is a characteristic constant for each enzyme-substrate system and reflects the affinity of the enzyme for the substrate.

Regarding Enzyme Kinetics,the Substrate Concentration at Which the Reaction Velocity