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JIPMER2011BotanyBiomolecules (B)

An example of competitive inhibition of an enzyme is the inhibition of

Options

  1. Asuccinic dehydrogenase by malonic acid
  2. Bcytochrome oxidase by cyanide
  3. Chexokinse by glucose-6-phosphate
  4. Dcarbonic anhydrase by carbon dioxide

Correct answer

A. succinic dehydrogenase by malonic acid

Step-by-step solution

Classical example of competitive inhibition is reduction of activity of succinate dehydrogenase by malonate, oxaloacetate and other anions. In competitive inhibition, a competitive inhibitor which has the resemblance with substrate molecule, competes with the substrate for the active site of an enzyme. While the inhibitor (I) occupies the active site, it prevents binding of the substrate to the enzyme.

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