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Vitamins and Coenzymes

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

Iron
Zinc
Copper
Cobalt

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

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

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Vitamins and Coenzymes
Lipoic acid is a co-factor of the

α-ketoglutaric dehydrogenase
both (a) and (b)
di-hydroorotate dehydrogenase
pyruvic dehydrogenase

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Vitamins and Coenzymes
The most prominent role that tocopherol has in in-vitro systems is as a strong

antioxidants
reducing agent
oxidizing agent
all of these

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Vitamins and Coenzymes
A deficiency of Vitamin K results in a decreased level of

thrombin
prothrombin
fibrinogen
fibrin

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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
four isoprene units
nine isoprene units

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