Final answer:
When [K]in is changed to 1mM, it implies a change in the substrate concentration, which affects the reaction velocity (Vm) based on the Michaelis-Menten equation. If 1mM equals the Km, the enzyme's reaction velocity will be half of the Vmax.
Step-by-step explanation:
If [K]in is changed to 1mM, it suggests that the substrate concentration has been adjusted to 1 millimolar. According to the Michaelis-Menten kinetics, Km is the substrate concentration at which the reaction velocity is half its maximum value (Vmax). The question seems to be referring to the behavior of enzyme kinetics where Vm stands for the maximum velocity of the reaction.
Changing [K]in to 1mM implies adjusting the substrate concentration. The reaction velocity at this new concentration can be calculated using the Michaelis-Menten equation: V = (Vmax[S]) / (Km + [S]), where [S] is the substrate concentration. If 1mM is equal to the Km, the reaction velocity will be at half the maximum velocity, and any changes in [S] above or below the Km will affect the Vm accordingly, following the hyperbolic nature of the Michaelis-Menten curve.