Which of the following is TRUE of a graph of velocity versus [S] in which the data were obtained when enzyme was added to the system?
Please choose the correct answer from the following choices,

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BlackTom AI · Accepted Answer

First, restating the scenario helps anchor the thinking: we are plotting velocity (V) against substrate concentration [S] for a system where enzyme is present, i.e., typical enzyme kinetics behavior. 
Option 1: 'None of the above.' This is a catch-all option, suggesting that none of the described plots or relationships fit the true V versus [S] behavior for enzyme-catalyzed reactions. 
Option 2: 'It would be an inverse parabola.' An inverse parabola would imply V is proportional to 1/[S] squared or a similar inverse quadratic relationship, which is not consistent with the standard Michaelis–Menten behavior where velocity rises toward a maximum as [S] increases, flattening out hyperbolically rather than following a curved inverse-square form. 
Option 3: 'It would allow for the determination of k–1 of the enzyme.' The rate constant k-1 refers to the dissociation of the enzyme–substrate complex back to enzyme and substrate. A direct V versus [S] plot is not the typical data presentation from which k–1 is read off; k–1 is usually inferred from kinetic schemes or from more detailed transient-state analyses, not from a simple steady-state velocity versus substrate plot. 
Option 4: 'It would be a Lineweaver-Burke plot.' The Lineweaver–Burke plot is a double reciprocal plot of 1/V versus 1/[S], not V versus [S], so it is not the correct description of the plain velocity versus substrate concentration graph. 
Option 5: 'The equation describing the resulting plot would be in the form of y = mx + b.' The Michaelis–Menten relationship V = (Vmax [S])/(Km + [S]) is hyperbolic, not linear in [S], so a straight-line equation y = mx + b does not describe the untransformed V versus [S] plot. 
Across the options, the only one that correctly characterizes the standard V vs. [S] scenario is that none of the listed descriptors match the typical hyperbolic Michaelis–Menten relationship, so none of the provided options accurately describe the velocity vs [S] plot for an enzyme-catalyzed reaction. 
Thus, none of the listed descriptions align with the canonical V versus [S] behavior under enzyme-catalyzed kinetics, given the steady-state Michaelis–Menten framework.

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Which of the following is TRUE of a graph of velocity versus [S] in which the data were obtained when enzyme was added to the system? Please choose the correct answer from the following choices,

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