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Vitamins and Coenzymes

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

xeropthalmia
keratinization
night blindness
none of these

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

oxidizing agent
all of these
antioxidants
reducing agent

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Vitamins and Coenzymes
Dihydroorotate dehydrogenase contains

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

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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
Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

either end via two disulfide bonds
either end via a single disulfide bond
both ends by one disulfide bond
both ends by two disulfide bonds

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

Copper
Cobalt
Iron
Zinc

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