<prompt> Glutathione peroxidase is aan -CatalaseAntioxidantMicrosomal enzymeNone  <response>: Ans. is b i.e., Antioxidant o A series of enzymes acts as free radical-scavenging systems and breakdown hydrogen peroxide and superoxide anion.1. Catalaseo Present in peroxisomes and decomposes H2O2,2. Superoxide desmutase SODo Manganese - superoxide dismutase is present in mitochondria, while copper-zinc-superoxide dismutase is found in the cytosol,o It converts superoxide to H2O2,3. Glutathione peroxidaseo Present in mitochondria cytosolo It catalyzes free radical breaksown.H2O2, 2GSH - GSSG 2H2O20H2GSH - GSSG 2 H2Oo Intracellular ratio of oxidized glutathione G S S G to reduced glutathione G S M is a reflection of the oxidative state of the cell. 