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Vitamins and Coenzymes

Vitamins and Coenzymes
The symptoms of retinol excess are

all of these
weakness
nausea
bone fragility

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Vitamins and Coenzymes
Vitamin B12 (Cobalamin) is only synthesized by

plants
micro-organisms
fishes
animals

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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
An early sign of retinol deficiencies in man is

xeropthalmia
keratinization
none of these
night blindness

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

plants
plants and animals both
animal
none of these

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Vitamins and Coenzymes
Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

six isoprene units
nine isoprene units
four isoprene units
four isoprene units

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