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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of these is a vitamin A precursor?

Thiamine
Beta-Carotene
Cobalamin
Pyridoxine

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

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

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

animal
plants
plants and animals both
none of these

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Vitamins and Coenzymes
Which of these is a symptom of vitamin A deficiency?

Impaired blood clotting
Impaired taste perception
Blindness
Osteoporosis

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Vitamins and Coenzymes
Lipoic acid exists in

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

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Vitamins and Coenzymes
Vitamin B12 is useful in the prevention and treatment of

scurvy
cataract
beri-beri
pernicious anemia

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