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Vitamins and Coenzymes

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

Activated carbon dioxide (CO2)
Ammonia
Sulfhydryl group
Methyl group

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Vitamins and Coenzymes
Vitamins are essential because the organism

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

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Vitamins and Coenzymes
An early sign of retinol deficiencies in man is

xeropthalmia
none of these
night blindness
keratinization

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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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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.

adenine
hydroxycobalamin
cyanocobalamin
5-6 dimethylbenzimidazole

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Vitamins and Coenzymes
Dihydroorotate dehydrogenase contains

2 flavins and 2 atoms of iron per molecule
4 flavins and 4 atoms of iron per molecule
2 flavins and 4 atoms of iron per molecule
4 flavins and 2 atoms of iron per molecule

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