A researcher has designed a new type of inhibitor that binds at the active site of an enzyme. What type of Inhibition does this molecule display?
Correct answer: C. Competitive inhibition
- A. Uncompetitive inhibition
- B. Noncompetitive inhibition
- C. Competitive inhibition
- D. All of these
Explanation
If a new inhibitor binds at the active site of an enzyme, it is displaying competitive inhibition. Competitive inhibitors are molecules that closely resemble the substrate of an enzyme and compete for binding to the enzyme's active site. By occupying the active site, the competitive inhibitor blocks the substrate from binding, preventing the normal catalytic reaction from taking place.
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About Enzymes
Enzymes are biological catalysts that lower activation energy without being consumed, and their specificity is explained by the lock and key and induced fit models. Work includes the effects of temperature, pH and substrate concentration on reaction rate, plus competitive and non-competitive inhibition and how these differ.
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