This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanisms of Enzyme Action, Subject name: Biochemistry
[{'content': 'Glutathione peroxidase is a/an - \nSelect and explain. \nA. Catalase, B. Antioxidant, C. Microsomal enzyme, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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 (SOD)o 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 + 2H2O20H+2GSH - 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.", 'role': 'assistant'}]