KS3 8A Nutrition and digestion 69marks - …

Iodine is one of the most abundant electron-rich essential element in the diet of marine and terrestrial organisms. It is transported from the diet to the cells via iodide transporters. Iodide, which acts as a primitive electron-donor through peroxidase enzymes, seems to have an ancestral antioxidant function in all iodide-concentrating cells ... ................
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