Final answer:
The line representing competitive inhibition on an enzyme activity graph would approach the activity of the uninhibited enzyme at high substrate concentrations after initially showing a slower rate due to the presence of the inhibitor.
Step-by-step explanation:
If the dashed line in the graph represents an uninhibited enzyme, the solid line that represents the same enzyme under competitive inhibition would be one that eventually reaches the same maximum rate as the uninhibited enzyme but has a slower rate of reaction at lower substrate concentrations. This occurs because competitive inhibitors are structurally similar to the substrate and can bind reversibly to the active site, thereby blocking the substrate from binding. However, at higher substrate concentrations, the substrate can outcompete the inhibitor, allowing the enzyme to reach its normal maximum rate, which is demonstrated by the curve that eventually meets the dashed line at high substrate levels.
Based on the description provided, this would be represented by a curve (not shown in the reference information) that initially lies below the dashed line but approaches it as substrate concentration increases. The reference to the green line as the uncatalyzed reaction and the purple line as the catalyzed reaction does not directly address competitive inhibition, and the blue line is described as representing a noncompetitive inhibitor, which achieves a lower maximum rate regardless of substrate concentration.