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Vitamins and Coenzymes

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

Beta-Carotene
Pyridoxine
Thiamine
Cobalamin

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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
all of these
oxidizing agent

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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
In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

hydroxycobalamin
cyanocobalamin
5-6 dimethylbenzimidazole
adenine

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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
Vitamin-D deficiency can cause

rickets
beri-beri
pernicious anemia
cataract

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