Vitamins and Coenzymes
Selenium is an essential component of the enzyme glutathione peroxidase which

None of these
scavenges toxic hydoperoxycompounds in tissues
oxidizes toxic hydoperoxycompounds in tissues
reduces toxic hydoperoxycompounds in tissues

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Vitamins and Coenzymes
The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become

colorless on reduction with Zn in acid and regained its color on re-oxidation
colorless on oxidation and regained its color on reduction with Zn in acid
more deep in color on reduction with Zn in acid and regained its color on re-oxidation
more deep in color on oxidation and regained its color on reduction with Zn in acid

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