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Vitamins and Coenzymes

Vitamins and Coenzymes
β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by

none of these
plants and animals both
plants
animal

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Vitamins and Coenzymes
The absence of ascorbic acid in the human diet gives rise to

pernicious anemia
rickets
cataract
beri-beri

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Vitamins and Coenzymes
An enzyme, L-folate reductase reduces folic acid to

trihydrofolic acid
dihydrofolic acid
hydrofolic acid
tetrahydrofolic acid

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Vitamins and Coenzymes
In one iron-metalloflavoprotein, the iron is present as a

both (a) and (b)
flavin moiety
heme-protein
nonheme type

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Vitamins and Coenzymes
Lipoic acid exists in

reduced form
oxidized form
oxidized and reduced form both
none of these

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

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

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