The enzymes are proteins having high molecular weight. Enzymes are highly specific in their action. Enzymes action can be inhibited by certain chemicals. It is called enzyme inhibition, e.g. noncompetitive inhibition.
Non-competitive inhibition : Some chemicals act like poison and destroy the enzyme structure. Non-competitive inhibitors do not resemble the substrate in structure. They inhibit the enzyme action by binding to the enzyme at the place other than the active site, e.g. cyanide inhibits the mitochondrial enzyme cytochrome oxidase which is necessary for respiration.
