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Hydrogen peroxide as a reactive oxygen species (ROS) is a highly problematic molecule for the processes inside of cells (it can spontaneously oxidize and damage cellular components). With Catalase, organisms have a very effective enzyme which degrades the peroxide into water and oxygen. However, although the molecule is problematic, it is still produced by ...


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Actually, there's a lot of animals, plants and microbes can do it. However, it is just an Intermediate process in general. Here's a strong example. In the condition with the absence of catalase, glucose oxidase can catalyze glucose + H2O + O2 become gluconic acid + H2O2. Another process can also generate H2O2 catalyzed by Ero1.



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