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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of the following compounds/(s) belong/(s) to the vitamin B6 group?

All of these
Pyridoxine
Pyridoxal
Pyridoxamine

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

Activated carbon dioxide (CO2)
Methyl group
Ammonia
Sulfhydryl group

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Vitamins and Coenzymes
A deficiency of niacin causes

cataract
anemia
pellagra
scurvy

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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.

5-6 dimethylbenzimidazole
hydroxycobalamin
cyanocobalamin
adenine

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Vitamins and Coenzymes
The occurrence of metals such as iron or molybdenum in some flavoproteins can

stabilize the semiquinone
form chelation
de-stabilize the semiquinone
all of these

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Vitamins and Coenzymes
Vitamin B12 (Cobalamin) is only synthesized by

plants
fishes
animals
micro-organisms

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