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Vitamins and Coenzymes

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

Sulfhydryl group
Ammonia
Methyl group
Activated carbon dioxide (CO2)

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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
adenine
cyanocobalamin
5-6 dimethylbenzimidazole

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

oxidizing agent
antioxidants
reducing agent
all of these

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Vitamins and Coenzymes
Vitamins are essential because the organism

can't synthesize these compounds at all
None of these
can synthesize these compounds partially
can't synthesize these compounds in the adequate amounts

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

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

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

scurvy
pernicious anemia
beri-beri
cataract

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