<prompt> Which of the following enzymes is known as suicide enzyme?CyclooxygenaseLipoxygenasePhospholipase CXanthine oxidase  <response>: Cyclooxygenase can switch off the synthesis of prostaglandins by undergoing self-catalysed destruction. That is why this enzyme is known as suicidal enzyme. Do not confuse this with suicidal inhibition. Cyclooxygenase aka prostaglandin H synthase Bifunctional enzyme with two activities - cyclooxygenase and peroxidase. There are two isoenzymes of cyclooxygenase, COX-1 Constitutive and COX-2 Inducible. 