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Vitamins and Coenzymes

Vitamins and Coenzymes
Lipoic acid exists in

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

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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
four isoprene units
nine isoprene units
four isoprene units

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Vitamins and Coenzymes
A fat-soluble vitamin that regulates blood clotting is

vitamin A
niacin
vitamin K
vitamin C

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Vitamins and Coenzymes
The prosthetic group biotin is a carrier of which type of molecule?

Sulfhydryl group
Activated carbon dioxide (CO2)
Ammonia
Methyl group

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

none of these
animal
plants
plants and animals both

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Vitamins and Coenzymes
What metal ion is specifically bound by vitamin B12?

Copper
Iron
Zinc
Cobalt

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