peroxidase is an enzyme found in many organisms, from plant to humans. the function of peroxidase is to break down hydrogen peroxide, which is a toxin produced as a byproduct when oxygen is produced during respiration. salivary peroxidase is an enzyme that fights against bacteria and other harmful microorganisms that might enter the body through the oral passage. salivary peroxidase forms an oral antioxidant system that attacks against free radicals produced by cigarette smoke. by smoking a single cigarette, there is a sharp drop in levels of salivary peroxidase activity. (8 points) identify two examples of environmental factors that may impact salivary peroxidase activity. describe how each of the environmental factors would affect the reaction rate of the enzyme. predict the effects of a long-time cigarette smoker and the impacts on activity levels of salivary peroxidase. provide reasoning to justify your prediction.