1. WJEC GCE BIOLOGY Inhibitors and Enzyme Action Graphs to show the effects of Inhibitors on Enzyme Action 3.2

2. WJEC GCE BIOLOGY Inhibitors and Enzyme Action 1 Rate of reaction Substrate concentration

3. WJEC GCE BIOLOGY Inhibitors and Enzyme Action Explanation Forward

4. WJEC GCE BIOLOGY Inhibitors and Enzyme Action 1 2 Rate of reaction Substrate concentration

5. WJEC GCE BIOLOGY Inhibitors and Enzyme Action ExplanationClose Every active site is saturated. The rate of the reaction is at its highest. Forward

6. WJEC GCE BIOLOGY Inhibitors and Enzyme Action 1 2 3 Rate of reaction Substrate concentration

7. WJEC GCE BIOLOGY Inhibitors and Enzyme Action Forward ExampleClose Every active site is saturated, so there is no increase in the rate of reaction.

8. WJEC GCE BIOLOGY Inhibitors and Enzyme Action 1 2 3 Competitive Inhibitor Revise Rate of reaction Substrate concentration

9. WJEC GCE BIOLOGY Inhibitors and Enzyme Action 1 2 Non-competitive Inhibitor Revise Rate of reaction Substrate concentration

10. WJEC GCE BIOLOGY Inhibitors and Enzyme Action Forward CloseExplanation A competitive inhibitor binds to the enzyme’s active site, and slows down the process.

11. WJEC GCE BIOLOGY Inhibitors and Enzyme Action ExplanationClose The substrate will soon find an active site. The effect of a competitive inhibitor is to slow down the process. Forward

12. WJEC GCE BIOLOGY Inhibitors and Enzyme Action 1 2 Rate of reaction Revise Substrate concentration

13. WJEC GCE BIOLOGY Inhibitors and Enzyme Action CloseExplanation The shape of the active site changes because the non- competitive inhibitor has bound to an allosteric site; so preventing an enzyme- substrate complex from forming. Forward

14. WJEC GCE BIOLOGY Inhibitors and Enzyme Action CloseExplanation The reaction rate cannot reach the same point because the non- competitive inhibitors have changed the shape of some of the active sites. Forward