Question

Which of the following statements about a plot of V0 versus [S] for an enzyme that follows Michaelis-Menten kinetics is true? A) Km is the [S] at which V0 has become equal to Vmax. B) The plot gives a straight line. C) At very high [S], the V0 versus [S] curve approaches a horizontal line that, when extrapolated back, intersects the y-axis at Vmax. D) The plot is a curve that becomes steeper as [S] becomes larger. E) The y-axis has units of concentration.

Answer 1

The statement that is true about a plot of V0 versus [S] for an enzyme that follows Michaelis-Menten kinetics is that at very high [S], the V0 versus [S] curve approaches a horizontal line that, when extrapolated back, intersects the y-axis at Vmax.

Step-by-step explanation:

The statement that is true about a plot of V0 versus [S] for an enzyme that follows Michaelis-Menten kinetics is:

C) At very high [S], the V0 versus [S] curve approaches a horizontal line that, when extrapolated back, intersects the y-axis at Vmax.

In Michaelis-Menten kinetics, the V0 versus [S] plot initially increases as substrate ([S]) concentration increases, but eventually reaches a maximum velocity (Vmax). At very high substrate concentrations, the V0 versus [S] curve becomes nearly horizontal, indicating that the reaction is proceeding at its maximum rate. Extrapolation of this curve back to the y-axis (where V0 is 0) gives the value of Vmax.

Answer 2

C) At very high [S], the V0 versus [S] curve approaches a horizontal line that, when extrapolated back, intersects the y-axis at Vmax.

Step-by-step explanation:

The velocity of reaction Vo increases with increasing substrate concentration giving a curve but until enough enzyme is present to convert the substrate to product, once the Vmax is reached, all the enzymes are occupied and adding further substrate won't increase Vo.

Km is the substrate concentration at which Vo is half of Vmax.

The plot is a curve

The plot does not become steeper with substrate concentration.

y-axis has units of Vo or velocity.