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(A) The Michaelis-Menten equation describes the rate of enzymatic reactions by relating the reaction rate $V$ to the substrate concentration $[S]$.The

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Concentration of substrate at which the rate of reaction is $\frac{1}{2} V_{	ext{max}}$

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(A) The Michaelis-Menten equation describes the rate of enzymatic reactions by relating the reaction rate $V$ to the substrate concentration $[S]$.The equation is given by: $V = \frac{V_{	ext{max}}[S]}{K_m + [S]}$.In this equation,$K_m$ (the Michaelis constant) is defined as the substrate concentration at which the reaction rate is exactly half of the maximum velocity $(V_{	ext{max}})$.Looking at the provided graph,the x-axis represents the substrate concentration $[S]$.The point $X$ on the x-axis corresponds to the velocity $\frac{V_{	ext{max}}}{2}$ on the y-axis.Therefore,$X$ represents the Michaelis constant $(K_m)$,which is the substrate concentration at which the reaction rate is $\frac{1}{2} V_{	ext{max}}$.

In the graphical representation of Michaelis-Menten kinetics,$X$ represents:

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