CAPE Biology Unit 1 · 2014 · Paper 1 · Question Q15

Item 15 refers to the graph below showing the rates of reaction of an enzyme with and without inhibitors. Which of the following describes the reaction represented by the curves, X, Y and Z? \begin{tabular}{|l|c|c|c|} \hline & \textbf{Reaction with No Inhibitor} & \textbf{Reaction with a Competitive Inhibitor} & \textbf{Reaction with a Non-competitive Inhibitor} \\ \hline (A) & X & Y & Z \\ \hline (B) & X & Z & Y \\ \hline (C) & Y & X & Z \\ \hline (D) & Z & X & Y \\ \hline \end{tabular}

1. (A)Reaction with No Inhibitor: X; Reaction with a Competitive Inhibitor: Y; Reaction with a Non-competitive Inhibitor: Z
2. (B)Reaction with No Inhibitor: X; Reaction with a Competitive Inhibitor: Z; Reaction with a Non-competitive Inhibitor: Y
3. (C)Reaction with No Inhibitor: Y; Reaction with a Competitive Inhibitor: X; Reaction with a Non-competitive Inhibitor: Z
4. (D)Reaction with No Inhibitor: Z; Reaction with a Competitive Inhibitor: X; Reaction with a Non-competitive Inhibitor: Y

This question uses a figure or table from the paper — you'll see it when you practise.