| Text | Vitamins A and D serve as precursors for {{c1::hormones}}. Vitamins A, D, E and K are grouped as {{c2::fat-soluble}} vitamins |
| Back Extra | Isoprenoid compounds sunthesized by condensation of multiple isoprene units |
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| Text | Tocopherols (Vitamin E) are biological {{c1::antioxidants}}. The aromatic ring reacts with and destroys free radicals, protecting unsaturated fatty acids from oxidation and preventing oxidative damage to membrane lipids. |
| Back Extra | Symptoms of vitamin E deficiency in humans is fragile erythrocytes |
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| Text | Beta-carotene is the precursor for {{c1::Vitamin A}}. Oxidation at C-15 produces {{c2::retinoic acid}}, a hormone that regulates gene expression. |
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