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This article provides graphical representations to demonstrate the effects of inhibitors on the rate of enzyme action, specifically focusing on substrate concentration and different types of inhibitors (competitive and non-competitive). It explains how the rate of reaction changes when the active sites are saturated or inhibited by inhibitors.
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3.2 Graphs to show the effects of Inhibitors on Enzyme Action
Rate of reaction 1 Substrate concentration
Forward Explanation
2 Rate of reaction 1 Substrate concentration
Forward Every active site is saturated. The rate of the reaction is at its highest. Close Explanation
3 2 Rate of reaction 1 Substrate concentration
Forward Every active site is saturated, so there is no increase in the rate of reaction. Close Example
Competitive Inhibitor Revise 3 2 Rate of reaction 1 Substrate concentration
Non-competitive Inhibitor Revise 2 Rate of reaction 1 Substrate concentration
Forward A competitive inhibitor binds to the enzyme’s active site, and slows down the process. Close Explanation
Forward The substrate will soon find an active site. The effect of a competitive inhibitor is to slow down the process. Close Explanation
Revise 2 Rate of reaction 1 Substrate concentration
Forward 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. Close Explanation
Forward The reaction rate cannot reach the same point because the non-competitive inhibitors have changed the shape of some of the active sites. Close Explanation