<prompt> Which of the following is a peroxisomal free radical scavenger?Superoxide dismutaseGlutathione peroxidaseCatalaseSelenium  <response>: Ref Robbins 9e p15 Catalase, present in peroxisomes, catalyzes the decom- position of hydrogen peroxide 2H2O2 - O2 2H2O. It is one of the most active enzymes known, capable of degrading millions of molecules of H2O2 per second. Endogenous or exogenous antioxidants e.g., vitamins E, A, and C and b-carotene may either block the forma- tion of free radicals or scavenge them once they have formed. 