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Vitamins and Coenzymes

Vitamins and Coenzymes
The symptoms of retinol excess are

bone fragility
nausea
all of these
weakness

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

NAD+ and FAD
Coenzyme A and ubiquinone
NADH and FADH2
ATP and GTP

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Vitamins and Coenzymes
Ascorbic acid acts as an

oxidizing agent
None of these
reducing agent
oxidizing and reducing agent both

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

reducing agent
all of these
antioxidants
oxidizing agent

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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
cyanocobalamin
5-6 dimethylbenzimidazole
hydroxycobalamin

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Vitamins and Coenzymes
Lipoic acid exists in

oxidized form
reduced form
none of these
oxidized and reduced form both

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